Daikin Sky Air Advance RZA200D7Y1B User manual

Service manual
Sky Air Advance-series
RZA200D7Y1B
RZA250D7Y1B

Disclaimer
Service manual
2
RZA200+250D7Y1B
Sky Air Advance-series
ESIE19-13A – 2020.05
Disclaimer
The present publication is drawn up by way of information only and does not constitute an offer binding upon
Daikin Europe N.V.. Daikin Europe N.V. has compiled the content of this publication to the best of its knowledge.
No express or implied warranty is given for the completeness, accuracy, reliability or fitness for particular purpose
of its content and the products and services presented therein. Specifications are subject to change without prior
notice. Daikin Europe N.V. explicitly rejects any liability for any direct or indirect damage, in the broadest sense,
arising from or related to the use and/or interpretation of this publication. All content is copyrighted by Daikin
Europe N.V..

Version log
Service manual
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RZA200+250D7Y1B
Sky Air Advance-series
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Version log
Version code Description Date
ESIE19-13 Document release April 2020
ESIE19-13A Document release May 2020

Table of Contents
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Table of Contents
1 General operation 7
2 Troubleshooting 9
2.1 To access push buttons and 7-segment display............................................................................................................. 9
2.2 To retrieve error codes and check error history ............................................................................................................ 9
2.2.1 Via service monitoring tool ............................................................................................................................ 9
2.2.2 Via the indoor unit remote controller BRC1H ............................................................................................... 9
2.2.3 Via the outdoor unit ....................................................................................................................................... 11
2.2.4 Via the wired remote control BRC1E ............................................................................................................. 12
2.2.5 Via the wireless controller BRC7 .................................................................................................................... 14
2.2.6 Via the wired remote control BRC1D............................................................................................................. 15
2.3 To activate emergency operation................................................................................................................................... 16
2.4 Error based troubleshooting........................................................................................................................................... 18
2.4.1 E1-00 – Outdoor unit: PCB defect.................................................................................................................. 18
2.4.2 E2-00 – Open circuit on earth leakage detection core.................................................................................. 19
2.4.3 E3-00 – Outdoor unit: Actuation of high pressure switch............................................................................. 20
2.4.4 E4-00 – Abnormal suction pressure............................................................................................................... 21
2.4.5 E5-00 – Outdoor unit: Overheat of inverter compressor motor................................................................... 22
2.4.6 E7-00 – Outdoor unit: Malfunction of outdoor unit fan motor .................................................................... 23
2.4.7 E9-00 – Malfunction of electronic expansion valve....................................................................................... 23
2.4.8 EA-00 – Cooling/Heating switch abnormality ................................................................................................ 24
2.4.9 F3-00 – Outdoor unit: Malfunction of discharge pipe temperature/compressor body thermistor ............ 25
2.4.10 H3-00 – Outdoor unit: Malfunction of high pressure switch ........................................................................ 26
2.4.11 H4-00 – Low pressure switch abnormality .................................................................................................... 26
2.4.12 H9-00 – Outdoor unit: Malfunction of outdoor air thermistor ..................................................................... 27
2.4.13 J3-00 – Outdoor unit: Malfunction of discharge pipe thermistor/compressor body thermistor................. 28
2.4.14 J5-00 – Malfunction of suction pipe thermistor ............................................................................................ 28
2.4.15 J6-00 – Outdoor unit: Malfunction of heat exchanger thermistor ............................................................... 29
2.4.16 J7-00 – Outdoor unit: Intermediate heat exchanger thermistor abnormality ............................................. 29
2.4.17 J8-00 – Malfunction of refrigerant liquid thermistor .................................................................................... 30
2.4.18 L1-00 – Outdoor unit: Main PCB abnormality ............................................................................................... 30
2.4.19 L4-00 – Inverter radiation fin overheat.......................................................................................................... 31
2.4.20 L5-00 – Outdoor unit: Inverter instantaneous overcurrent .......................................................................... 32
2.4.21 L8-00 – Malfunction triggered by a thermal protection in the inverter PCB................................................ 33
2.4.22 L9-00 – Stall prevention time lag ................................................................................................................... 34
2.4.23 LC-00 – Malfunction in communication system of outdoor unit .................................................................. 34
2.4.24 P1-00 – Open phase power supply imbalance .............................................................................................. 35
2.4.25 P4-00 – Outdoor unit: Malfunction of radiating fin temperature sensor ..................................................... 36
2.4.26 PJ-00 – Capacity setting mismatch................................................................................................................. 36
2.4.27 U0-00 – Outdoor unit: Shortage of refrigerant ............................................................................................. 36
2.4.28 U1-00 – Malfunction by reverse phase/open phase ..................................................................................... 37
2.4.29 U2-00 – Outdoor unit: Defect of power supply voltage ................................................................................ 38
2.4.30 U4-00 – Indoor/outdoor unit communication problem................................................................................ 39
2.4.31 UA-00 – Indoor unit, outdoor unit mismatching problem ............................................................................ 40
2.4.32 UF-00 – Reversed piping or bad communication wiring detection............................................................... 40
2.4.33 Indoor unit related error codes...................................................................................................................... 41
2.5 Symptom based troubleshooting ................................................................................................................................... 42
2.5.1 Operation does not start................................................................................................................................ 42
2.5.2 Operation sometimes stops ........................................................................................................................... 42
2.5.3 Operation starts but the unit does not cool/heat ......................................................................................... 43
2.5.4 Operating noise and vibrations...................................................................................................................... 44
2.5.5 Abnormal high pressure ................................................................................................................................. 45
2.5.6 Abnormal low pressure .................................................................................................................................. 46
2.5.7 Indoor fan starts operating but the compressor does not operate.............................................................. 47
2.5.8 Operation starts and the unit stops immediately.......................................................................................... 48
2.5.9 Operation stops, unit cannot start for a while .............................................................................................. 48
2.5.10 Unit discharges white mist ............................................................................................................................. 49
3 Components 50
3.1 4-way valve...................................................................................................................................................................... 50
3.1.1 Checking procedures...................................................................................................................................... 50
3.1.2 Repair procedures .......................................................................................................................................... 53
3.2 Compressor ..................................................................................................................................................................... 56
3.2.1 Checking procedures...................................................................................................................................... 56
3.2.2 Repair procedures .......................................................................................................................................... 61

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3.3 Current sensor ................................................................................................................................................................ 65
3.3.1 Checking procedures...................................................................................................................................... 65
3.3.2 Repair procedures .......................................................................................................................................... 66
3.4 Expansion valve............................................................................................................................................................... 68
3.4.1 Checking procedures...................................................................................................................................... 68
3.4.2 Repair procedures .......................................................................................................................................... 70
3.5 Fan inverter PCB.............................................................................................................................................................. 74
3.5.1 Checking procedures...................................................................................................................................... 74
3.5.2 Repair procedures .......................................................................................................................................... 78
3.6 High pressure switch....................................................................................................................................................... 78
3.6.1 Checking procedures...................................................................................................................................... 78
3.6.2 Repair procedures .......................................................................................................................................... 80
3.7 Inverter PCB .................................................................................................................................................................... 81
3.7.1 Checking procedures...................................................................................................................................... 81
3.7.2 Repair procedures .......................................................................................................................................... 89
3.8 Low pressure switch ....................................................................................................................................................... 91
3.8.1 Checking procedures...................................................................................................................................... 91
3.8.2 Repair procedures .......................................................................................................................................... 92
3.9 Main PCB ......................................................................................................................................................................... 95
3.9.1 Checking procedures...................................................................................................................................... 95
3.9.2 Repair procedures .......................................................................................................................................... 98
3.10 Noise filter PCB ............................................................................................................................................................... 101
3.10.1 Checking procedures ...................................................................................................................................... 101
3.10.2 Repair procedures .......................................................................................................................................... 105
3.11 Outdoor unit fan motor .................................................................................................................................................. 107
3.11.1 Checking procedures ...................................................................................................................................... 107
3.11.2 Repair procedures .......................................................................................................................................... 108
3.12 Plate work ....................................................................................................................................................................... 111
3.12.1 To open the outdoor unit............................................................................................................................... 111
3.12.2 To remove the top plate................................................................................................................................. 112
3.12.3 To remove the front plate.............................................................................................................................. 112
3.12.4 To remove the compressor sound insulation ................................................................................................ 112
3.12.5 To remove the switch box .............................................................................................................................. 113
3.12.6 To install the switch box................................................................................................................................. 116
3.12.7 To access the back side of the switch box ..................................................................................................... 119
3.13 Reactor ............................................................................................................................................................................ 121
3.13.1 Checking procedures ...................................................................................................................................... 121
3.13.2 Repair procedures .......................................................................................................................................... 122
3.14 Solenoid valve ................................................................................................................................................................. 122
3.14.1 Checking procedures ...................................................................................................................................... 122
3.14.2 Repair procedures .......................................................................................................................................... 124
3.15 Thermistors ..................................................................................................................................................................... 128
3.15.1 Refrigerant side thermistors .......................................................................................................................... 128
4 Third party components 135
4.1 Electrical circuit............................................................................................................................................................... 135
4.1.1 Checking procedures...................................................................................................................................... 135
4.1.2 Repair procedures .......................................................................................................................................... 137
4.2 Refrigerant circuit ........................................................................................................................................................... 137
4.2.1 Checking procedures...................................................................................................................................... 137
4.2.2 Repair procedures .......................................................................................................................................... 142
4.3 External factors ............................................................................................................................................................... 147
4.3.1 Checking procedures...................................................................................................................................... 147
5 Maintenance 149
5.1 To clean the outdoor unit heat exchanger..................................................................................................................... 149
6 Technical data 150
6.1 Detailed information setting mode ................................................................................................................................ 150
6.1.1 Detailed information setting mode: Outdoor unit ........................................................................................ 150
6.2 Wiring diagram................................................................................................................................................................ 151
6.2.1 Wiring diagram: Outdoor unit........................................................................................................................ 151
6.2.2 Wiring diagram: Indoor unit........................................................................................................................... 155
6.3 Piping diagram ................................................................................................................................................................ 156
6.3.1 Piping diagram: Outdoor unit......................................................................................................................... 156
6.3.2 Piping diagram: Indoor unit............................................................................................................................ 157
6.4 Component overview...................................................................................................................................................... 158
6.4.1 Component overview: Outdoor unit.............................................................................................................. 158
6.4.2 Component overview: Indoor unit................................................................................................................. 160
6.5 Wiring overview .............................................................................................................................................................. 161

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6.6 Field information report ................................................................................................................................................. 166
6.7 Service tools .................................................................................................................................................................... 169
6.8 Field settings ................................................................................................................................................................... 170
6.8.1 Field settings: Outdoor unit ........................................................................................................................... 170
6.8.2 Field settings: Indoor unit .............................................................................................................................. 179

1 | General operation
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1 General operation
The Sky-Air is typically used for cooling or heating in commercial applications.
Some units also have settings to perform technical cooling. The medium which is
used to transfer the heat from inside to outside or vice versa, is refrigerant. In case
of the RZA200+250D7, the refrigerant which is used, is R32.
There are four different piping combinations to indoor units:
▪Pair
▪Twin
▪Triple
▪double twin.
They all have the same operation principle. Unlike multi‑system, they have only
one main expansion valve controlling the refrigerant flow to all indoor unit(s).
a
b
c
d
e
f
f
b
aCompressor
bIndoor heat exchanger (up to 4 indoor units)
cExpansion valve
dOutdoor heat exchanger
e4‑way valve
fStop valve
In case of heating, the compressor builds up pressure and hence the temperature
of the refrigerant is increased. The hot refrigerant is blown into the room by fan(s)
which blow over heat exchanger(s). Colder refrigerant flows back to the outdoor
unit, where temperature is further decreased by expansion through an expansion
valve. After the expansion valve, the refrigerant is capable of taking up heat again.
This is enabled by a fan that sucks outdoor air over a heat exchanger. This
refrigerant is then transported to the compressor where temperature is further
built up again and the cycle starts again. For cooling, it’s just the other way round.
Indoor units
Sky-Air systems have combination limits for different types of indoor units and also
limits for piping length and connection ratio for each indoor unit combination
pattern. Refer to the Engineering Databook.

1 | General operation
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The list below is only for reference of compatible units. Always refer to Engineering
Databook for compatibility.
Duct FDA200+250 High cassette
FCAHG-H
Thin cassette
FCAG-B
2x2 cassette FFA-A
Duct (medium ESP)
FBA-A
Ceiling suspended
FHA-A
Ceiling mounted
4‑way blow FUA-A
Wall mounted type
FAA-A
Duct (high ESP)
FDA125A
Slim duct FDXM-F
Floor standing type
FVA-A
Concealed floor
standing type FNA-
A

2 | Troubleshooting
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2 Troubleshooting
2.1 To access push buttons and 7-segment display
1Remove the service plate, see "3.12Plate work"[4111].
Result: The push buttons and 7-segment display are located on A1P behind the
service plate.
b
a
aPush buttons
b7-segment display
2.2 To retrieve error codes and check error history
2.2.1 Via service monitoring tool
With the service monitoring tool, it is possible to monitor not only error codes but
also some common retries and stepping down controls:
▪Unit error
▪Error code
▪High pressure retry
▪Low pressure retry
▪Discharge pipe retry
▪Inverter retry
▪High pressure stepping down control
▪Low pressure stepping down control
▪Over current stepping down control
▪Fin temperature stepping down control
▪Compressor discharging stepping down control
2.2.2 Via the indoor unit remote controller BRC1H
INFORMATION
Images are in English and for reference ONLY. For more details on the Madoka
Assistant please refer to the BRC1H training course material which is available on the
Daikin Business Portal.

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To retrieve the error code
To indicate a system error, the controller displays on the messages zone of the
home screen.
b
a
c
aMessages zone
bMiddle button
cError screen
1Press the middle button to enter the main menu from the home screen.
Result: An error screen is displayed.
2Press the middle button to return to the home screen.
Active error codes are also accessible through the Madoka Assistant for BRC1H.
The active error is shown on the home screen.
e gd f
dActive error
eHome screen
fError(s) details
gNotifications screen
3Tap the active error.
Result: The detail(s) of the error(s) are shown on the Notifications screen.
To check the error history
To check the error history with the Madoka Assistant for BRC1H:

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# Action Image for reference Result
1 Tap the settings icon. The Unit settings
screen is displayed.
2 Tap Errors and
warnings.
The Errors and
warnings screen is
displayed.
3 Tap Error history.
The Error history screen
is displayed.
2.2.3 Via the outdoor unit
Error code descriptions are accessible on “Mode 1: Monitor Mode”.
The table below shows which setting shows the error codes that led to an outdoor
unit forced stop.
When an error is generated, the unit performs a forced off until the error is
retrieved. The current error code will be shown on the 7‑segment display. You can
also access the error history on “Mode 1: Monitor Mode”.

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Mode Setting Description
Mode 1: Monitor
mode
4 Last error code
5 2nd last error code
6 3rd last error code
Please follow the procedure described below to access the regarding error code for
outdoor unit forced stop and/or retry description:
Action Result Display
Make sure the 7-segment
display indication is as
during normal operation.
To enter “Mode 1”, push
the (BS1) button one time
Mode 1 is accessed.
Push the (BS2) button as
many times as the setting
you want to go to.
The setting is accessed
(e.g. 17, Error code last
forced off)
Press the RETURN (BS3)
Button.
Malfunction/Retry item
will appear on display.
Press the SET (BS2)
Button.
Detailed Malfunction/
Retry sub-code will
appear on display.
Press SET (BS2) once
again to return to main
Malfunction/Retry
display.
Main Malfunction/Retry
item will appear on
display.
Press the RETURN (BS3)
Button to return to Home
Screen for “Monitoring
Mode”.
Home Screen for
“Monitoring Mode” will
appear on display.
Press the MODE (BS1)
Button to return to
“Normal Mode”.
Back in normal mode.
2.2.4 Via the wired remote control BRC1E
INFORMATION
Images are in English and for reference ONLY. For more details on the BRC1E please
refer to the user manual.
To retrieve the error code
In case of an error or warning, the operation lamp on the ON/OFF button blinks
and an error message or warning is displayed at the bottom of the screen.

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a
b
c
aOperation lamp on the ON/OFF button
bError message
cWarning
# Action Result
1 Press. The error code appears on the
screen. The content of the error/
warning is displayed.
To Check the error history
# Action Result
1 Go to the basic screen.
Cool
Set to
28°C
2 Press at least 4seconds while the
backlight of the screen is lit.
The Service Settings screen is
displayed.
3 Select Error History
4 Press. The Error History screen is
displayed.
5 Select RC Error History or Indoor
Unit Error History.

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# Action Result
6 Press. ▪The RC Error History screen
shows error history for all units
in case of group control
▪The Indoor Unit Error History
screen shows error history of the
selected indoor unit
2.2.5 Via the wireless controller BRC7
To retrieve the error code
e
c
d
b
a
g
f
aINSPECTION/TEST button
bUnit No.
cUP button
dDOWN button
eMODE button
fLeft digit
gRight digit
1Press and hold INSPECTION/TEST button for 5seconds.
Result: The "unit indication" is displayed on screen and Unit No. is displayed
as "0", blinking.
2Set the Unit No. via UP/DOWN buttons until a buzzer sound* is generated
from the indoor unit.
Result: *Possible buzzer sounds:
-3 short beeps; conduct all items of the following procedure.
-1 short beep; conduct steps 3 and 4. Continue the operation in step 4 until the
buzzer sounds continuously.
-Continuous buzzer; indicates the error code is confirmed.
3Press the MODE button.
Result: The left digit of the error code on display will blink.
4Press UP/DOWN buttons to change the left digit of the error code.
Result: The left digit changes as indicated below.

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UP button
DOWN button
5Continue to change until the matching buzzer sound** is generated.
Result: **Possible buzzer sounds:
-Continuous buzzer; both digits match with the error code.
-2 short beeps; left digit matches with the error code.
-1 short beep; right digit matches with the error code.
6Press the MODE button.
Result: The right digit of the error code on display will blink.
7Press UP/DOWN buttons to change the right digit of the error code.
Result: The right digit changes as indicated below.
UP button
DOWN button
8Continue to change until the matching buzzer sound*** is generated.
Result: ***Possible buzzer sounds:
-Continuous buzzer; both digits match with the error code.
-2 short beeps; left digit matches with the error code.
-1 short beep; right digit matches with the error code.
To check the error history
INFORMATION
It is not possible to acces the error history with the wireless controller BRC7.
2.2.6 Via the wired remote control BRC1D
To retrieve the error code
a
d
e
c
b
f
aRemote controller’s operation LED
bError code
cInspection display

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dTEST button
eUnit No.
fTemperature set button
If operation stops due to a malfunction, the remote controller’s operation LED will
blink and an error code will be displayed.
The error code will stay available at inspection mode even after forced off
operation or after the error is reset.
The inspection display and error code blink while an error is active.
To access the error code while in normal operation; follow the procedure below:
1Press TEST button once.
Result: Error code for corresponding Unit No will be displayed.
2Press TEST button.
Result: Indoor unit model code will be displayed.
3Press TEST button.
Result: Outdoor unit model code will be displayed.
4Press TEST button.
Result: TEST operation will be displayed.
5Press TEST button for the last time to return to home screen.
Result: The home screen appears.
To check the error history
To check the malfunction history, you will need to access Mode 40 on the BRC1D.
Mode 40 stands for malfunction history display.
1While in home screen, press TEST button for 5seconds.
Result: Field settings mode is accessed.
2While in field settings mode, press TEST button for 5seconds.
Result: Mode 40 is accessed.
3Push the temperature set button to change the History No.
No 1 stands for the latest error.
Result: The History No. and error code are displayed.
gh
gHistory No.
hError code
4Press TEST button to return to the home screen.
2.3 To activate emergency operation
The table below describes the purpose of the emergency operation.

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If… Then…
Remote controller is defective Emergency operation can be used to go
to cooling or heating. In emergency
operation, the compressor is forced to
operate until the defective indoor or
outdoor unit PCB is back online.
Indoor unit PCB is defective
Outdoor unit PCB is defective
Starting conditions
In case the customer strongly needs the heating/cooling operation while waiting
for the next service visit, you can manually operate the system by changing the
emergency switch on the indoor unit and outdoor unit PCB from "normal" to
"emergency". When emergency operation is active, the system CANNOT control
the room temperature.
Both the indoor and outdoor unit MUST be set to "emergency" while the power is
OFF.
Ending conditions
You can end the emergency operation by changing the emergency switch on the
indoor unit and outdoor unit PCB back to "normal" while the power is OFF.
Below table explains what will happen when the emergency switch is set to
"emergency":
Changing the emergency switch on
the…
Switches ON the…
Indoor unit ▪Indoor unit fan
▪Drain pump
Outdoor unit ▪Compressor
▪Outdoor unit fan
Activate emergency operation
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see "3.12Plate work"[4111].
1Set the emergency switch on the indoor unit PCB to the "emergency" position,
see indoor unit service manual for more information.
2Set the emergency DIP switch DS1‑1 on the outdoor unit PCB to the "ON"
position.
EMERGENCY
ON COOL
OFF HEAT
EMERGENCY
ON COOL
OFF HEAT
a b a b
aDS1‑1
bDS1‑2
EMERGENCY Emergency
ON On
OFF Off

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COOL Cool
HEAT Heat
3Set the emergency DIP switch DS1‑2 on the outdoor unit PCB to the desired
forced operating mode (Cooling or Heating).
4Turn ON the power using the respective circuit breaker.
5Turn ON the unit.
Result: The system starts operating in emergency operation.
Active components
Component Forced cooling Forced heating Forced defrost
Compressor ON ON ON
4‑way valve OFF ON OFF
Outdoor unit fan Steady‑state
control
Steady‑state
control
OFF
Indoor unit fan Steady‑state
control
Steady‑state
control
OFF
Drain pump ON ON ON
Additional info
▪The unit will NOT regulate the temperature during emergency operation.
▪During emergency operation, do NOT attempt to operate the system using the
remote controller. The remote controller shows "88" while emergency operation
is active on the indoor unit.
▪If a safety device is activated during emergency operation, all actuators are
turned OFF.
▪In cooling operation, the unit runs for 20minutes and then stops for 10minutes
in order to avoid freeze‑up of the indoor unit coil.
▪In heating operation, defrost is activated for 3minutes, once every hour.
▪Emergency operation CANNOT be carried out when the PCB itself is seriously
damaged.
▪Make sure to set the emergency switch on both the outdoor and indoor unit
PCB.
▪Change the position of the emergency switch ONLY when the power is turned
OFF.
▪When the communication between the indoor unit(s) and outdoor unit is
repaired, emergency operation will stop and the system returns to normal
operation.
2.4 Error based troubleshooting
2.4.1 E1-00 – Outdoor unit: PCB defect
Trigger Effect Reset
Main PCB detects that
EEPROM is abnormal.
Unit will stop operating. Manual reset via user
interface.
Power reset.

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To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1Perform a check of the main PCB. See "3.9Main PCB"[495].
Possible cause: Faulty main PCB.
2Check if the power supply is conform with the regulations. See "4.1Electrical
circuit"[4135].
Possible cause:
▪Faulty or disturbance of the power supply (imbalance >10%),
▪Power drop,
▪Short circuit.
3Perform a check of the outdoor unit fan motor. See "3.11 Outdoor unit fan
motor"[4107].
Possible cause: Faulty outdoor unit fan motor.
4Perform a check of the compressor. See "3.2Compressor"[456].
Possible cause: Faulty compressor.
Prerequisite: Stop the unit operation via the user interface.
5Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Confirm the rectifier voltage is below 10VDC before proceeding, see "To check the
rectifier voltage"[4135].
6Check that the thermal interface grease is applied properly on the (PCB or
refrigerant piping) contact surface of the heat sink. Adjust if needed.
Possible cause: Thermal interface grease NOT applied properly on the heat
sink.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.4.2 E2-00 – Open circuit on earth leakage detection core
Trigger Effect Reset
Main PCB detects open
circuit on connector
X101A.
Unit will stop operating. Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1Check that connector X101A is correctly connected to the main PCB. See
"3.9Main PCB"[495].
Possible cause: Open circuit on connector X101A.

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Sky Air Advance-series
ESIE19-13A – 2020.05
2Perform a check of the current sensor. See "3.3Current sensor"[465].
Possible cause: Faulty current sensor.
3Perform a check of the main PCB. See "3.9Main PCB"[495].
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.4.3 E3-00 – Outdoor unit: Actuation of high pressure switch
Trigger Effect Reset
High pressure switch
opens due to measured
pressure above high
pressure switch operating
point.
Unit will stop operating. Manual reset via user
interface.
High pressure control
(measured pressure just
below high pressure
switch operating point)
occurs 16 times within
300minutes.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1Check that all stop valves of the refrigerant circuit are open. See
"4.2Refrigerant circuit"[4137].
Possible cause: Closed stop valve in the refrigerant circuit.
2Perform a check of the high pressure switch. See "3.6 High pressure
switch"[478].
Possible cause: Faulty high pressure switch.
3Perform a check of the main PCB. See "3.9Main PCB"[495].
Possible cause: Faulty main PCB.
4Check if the refrigerant circuit is correctly charged. See "4.2 Refrigerant
circuit"[4137].
Possible cause: Refrigerant overcharge.
5Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See "4.2Refrigerant circuit"[4137].
Possible cause: Non‑condensables and/or humidity in the refrigerant circuit.
6Check if the refrigerant circuit is clogged. See "4.2Refrigerant circuit"[4137].
Possible cause: Clogged refrigerant circuit.
7Perform a check of the outdoor unit fan motor. See "3.11 Outdoor unit fan
motor"[4107].