IVT X Series User manual

Fault tracing tree
X11-X15
6 720 619 265-18.1I
6 720 643 196 (2010/02)

Table of Contents
6 720 643 196 (2010/02)
2
Table of Contents
1 Symbol explanations and safety instructions . . 3
1.1 Symbol explanations . . . . . . . . . . . . . . . . . 3
1.2 Safety instructions . . . . . . . . . . . . . . . . . . 3
2 Rectify interference . . . . . . . . . . . . . . . . . . . . . . 4
2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Instructions on how to use the fault tables 4
2.3 General faults . . . . . . . . . . . . . . . . . . . . . . 4
2.3.1 Display out . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3.2 Tripped low pressure switch . . . . . . . . . . . 5
2.3.3 Tripped high pressure switch . . . . . . . . . . 7
2.3.4 High hot gas temperature T6 . . . . . . . . . . 10
2.3.5 High forward flow T1 . . . . . . . . . . . . . . . . 11
2.3.6 High temperature difference heating system
water . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3.7 Low heat transfer fluid (coll.) in . . . . . . . 14
2.3.8 Low heat transfer fluid (coll.) out . . . . . . 15
2.3.9 T1-T3, T6-T11 . . . . . . . . . . . . . . . . . . . . . 16
2.3.10 T5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3.11 T81 (pool control) . . . . . . . . . . . . . . . . . . 17
2.3.12 Electric element fault . . . . . . . . . . . . . . . 18
2.3.13 Heat pump now working at max. permitted
temp. (T8) . . . . . . . . . . . . . . . . . . . . . . . . 18
2.3.14 Electric element now working at max.
permitted temp. (T8) . . . . . . . . . . . . . . . . 18
2.3.15 Compressor does not reach correct
frequency . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.16 Fault in HTF pump G3 . . . . . . . . . . . . . . . 19
2.3.17 High temperature electric box . . . . . . . . 19
2.3.18 Check connection to AHB . . . . . . . . . . . . 20
2.3.19 Check connection to I/O circuit board . . 20
2.4 Troubleshooting the inverter section . . . 21
2.5 Alarm from driver circuit board . . . . . . . . 23
2.6 Alarm from heat transfer fluid (coll.) pump
G3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Symbol explanations and safety instructions
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1 Symbol explanations and safety instructions
1.1 Symbol explanations
There are different warning levels depending on the
damage risk if the warning is not noted.
•Note means that there is a risk of small material dam-
age.
•Warning means that there is a risk of personal injury
or severe material damage.
•Danger means that there is a risk of severe personal
injury.
1.2 Safety instructions
Repairs
BRepairs may only be carried out by an authorised serv-
ice technician!
BSwitch off the main power switch before carrying out
work on the unit!
BSwitch off the power to the unit ( e.g. via fuse, LS
switch) before starting work on the electrical part.
BOnly use original spare parts!
Instructions to the customer
BExplain that the customer may not modify or repair
the installation.
BRecommend that a function check is made regularly.
Warnings in the text are always marked by a
warning triangle and grey background.
Information in the text is marked by a sym-
bol next to it. It is highlighted by horizontal
lines above and below the text.

Rectify interference
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2 Rectify interference
2.1 General
Before fault tracing commences it is a good idea to
establish a picture of the heat pump status:
BCheck all temperatures in the main menu.
BStart all components manually and check motor
starts.
BCheck all settings on the unit that the customer can
change. If necessary, correct the settings or reset to
the factory settings.
2.2 Instructions on how to use the fault
tables
•Use the table from top to bottom and left to right.
•First make a note of the present settings and restore
them before leaving the appliance.
•Cover the question at 1. (check step). Depending on
the appropriate answer (yes or no) search in the cor-
responding line and carry out the actions stated
there; ignore the other responses.
•Æ3. means, later at stage 3, the intermediate stage is
not observed.
•If the fault is rectified the unit starts without an error
message, fault tracing is complete.
•If the fault remains after the actions have been taken
and also after restarting: Continue the work at the
next given stages.
•If another fault is revealed, use the relevant fault
tables
2.3.1 Display out
Check Action
1. Has the miniature circuit-breaker tripped
(green fuse)?
yes: BReset the fuse.
Did the remedy not work? Æ2
no: Æ2
2. BCheck that the transformer circuit
board has 230V input and 12V output.
yes: BReplace the fuse or transformer circuit board.
Did the remedy not work? Æ3
no: Æ3
3. Is the green LED (not the on/off LED) on
the control board (circuit board) flash-
ing?
yes: Æ4
no: BCheck the CANbus connections and terminations.
Did the remedy not work?
Æ6
4. Is the LED in the display flashing? yes: BPress on/off.
Did the remedy not work? Æ5
no: Æ5
5. Fault in the display. BReplace display.
6. Logic error in the control board. BReplace control board.
Tab. 1

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2.3.2 Tripped low pressure switch
Description: Too low pressure in the cooling circuit. Automatic resetting of the pressostat, which must be
acknowledged in the display. IMPORTANT! The cooling circuit must be frost protected down to at least -15 °C.
Check Action
1. Has the heat pump been stationary for a
period or has it just been commissioned
with the compressor?
yes: BAcknowledge the alarm, restart the compressor
(restart menu).
Does the error message recur? Æ2
no: Æ2
2. BManually operate G3.
Does G3 start? Does G3 run at 30%?
yes: Does the error message recur? Æ9
no: Æ3
3. BMeasure the connection on terminal
blocks for G3 (Do2 - N).
Is there 230V?
yes: Æ9
no: BCheck glass fuse, if intact replace I/O circuit
board.
4. Does the I/O circuit board transmit 3VDC
out on terminal block Ao2?
BEnsure that 10V control is selected
and that automatic pump control is
off. Example of correctly set Stratos in
10V operation running at 2600 rpm.
yes: BCheck wiring, 0-10 V, to the stratos pump. If
intact, replace the pump.
no: Æ5
5. Is the green LED on the I/O circuit board
flashing?
yes: BCheck wiring between I/O circuit board and pump.
Æ6
no: BCheck the CANbus and electrical supply to the I/O
circuit board.
Does the error message recur? Æ6
6. BCheck the dirt filter on the cold side.
Is there dirt in it?
yes: BClean the filter.
Does the error message recur? Æ7
no: Æ7
Tab. 2
6 720 643 196-01.1I
6 720 619 265-18.1I

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7. BCheck the flow in the collector circuit.
Is it OK?
yes: Æ9
no: BCheck the filler connector and any AV valves
Does the error message recur? Æ8
8. Is there enough fluid in the collector cir-
cuit?
yes: Æ9
no: BTop up with alcohol mixed fluid.
Does the error message recur? Æ9
9. Air in the collector circuit? Use a vent barrel.
BAt the same time check the frost protection in the
collector circuit fluid.
Does the error message recur? Æ10
10. BCheck that the LP switch trips at the
correct value (1.5 bar).
(Requires refrigeration authorisation and
a manometer stand).
yes: Does the error message recur? Æ11
no: Æ11
11. BCheck the connection to the LP switch
(Di1). Measure the ohmage at the
same time to see if the connection is
closed or broken (tripped).
Did that help?
yes: Does the error message recur? Æ12
no: Æ12
12. Faulty LP switch BReplace LP switch.
Description: Too low pressure in the cooling circuit. Automatic resetting of the pressostat, which must be
acknowledged in the display. IMPORTANT! The cooling circuit must be frost protected down to at least -15 °C.
Check Action
Tab. 2
6 720 643 196-01.1I

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2.3.3 Tripped high pressure switch
Description: Too high pressure in the cooling circuit. Automatic resetting of the pressostat, which must be
acknowledged in the display.
Check Action
1. BManually operate G2
Does G2 start?
yes: Does the error message recur? Æ7
no: Æ2
2. BMeasure the connection on terminal
blocks for G2 (Do1 - N)
Is there 230V?
yes: BReplace G2.
Does the error message recur? Æ3
no: BCheck connection/glass fuse, or if necessary
replace I/O circuit board.
Does the error message recur? Æ3
3. Does G2 increase in speed when relay
HR1 is affected?
BApply 230V to A1.
yes: Æ4
no: BReplace relay.
Does the error message recur? Æ4
4. BGo to alarm history.
What did the heat pump do on that occa-
sion, was the three-way valve connected?
yes: Æ7
no: Æ5
5. BCheck the dirt filter on the hot side.
Is there dirt in it?
yes: BClean the filter.
no: Does the error message recur? Æ6
6. BCheck the flow in the heating circuit.
Is it sufficient with the thermostats
open?
yes: Æ12
no: BOpen the thermostat valves.
Does the error message recur? Æ12
7. Air in the hot water heater. BVent the heater.
Does the error message recur? Æ8
8. BCheck the hot water setting.
Stop temperature in comfort mode =
63 °C Stop temperature in economy
mode = 57 °C
Does the error message recur?
yes: BReset the hot water settings to the default values.
Æ9
no: At a high incoming heat transfer fluid (collector) tem-
perature the hot water temperature must be reduced
slightly.
Does the error message recur? Æ9
Tab. 3
6 720 643 196-02.1I

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6 720 643 196 (2010/02)
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9. BCheck sensors T3, T8 and T9.
BCompare the correct table value (ohm
measurement) with the measured
temperature from an external ther-
mometer (accurate).
Do they correspond?
yes: Æ10
no: BCheck whether the sensor is correctly positioned.
Correct if necessary. If that didn’t help, replace
the sensor.
Does the error message recur? Æ10
10. BManually operate the three-way valve.
Does it react?
yes: Æ11
no: BCheck the connections, Do4 and Do4(L) against
zero.
In activated mode it must be 230V against zero.
Does the error message recur? Æ11
11. BRemove the motor. Use pliers to move
the valve stem in and out.
Does it move easily?
yes: BReinstall the motor (manually operate it to allow
the motor to engage in the valve stem)
Æ12
no: BReplace valve/insert.
Does the error message recur?
Æ12
Description: Too high pressure in the cooling circuit. Automatic resetting of the pressostat, which must be
acknowledged in the display.
Check Action
Tab. 3
6 720 643 196-02.1I

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6 720 643 196 (2010/02) 9
12. BCheck that the HP switch trips at the
correct value (31 bar).
Requires refrigeration authorisation and
a manometer stand.
yes: Does the error message recur? Æ13
no: Æ14
13. BCheck the connection to the HP
switch (terminal blocks 1, 2). Measure
the ohmage at the same time to see if
the connection is closed or broken
(tripped).
Did that help?
yes: Does the error message recur? Æ15
no: Æ15
14. Faulty HP switch BReplace HP switch.
Does the error message recur? Æ16
15. BCheck the connections between the
terminals (Di3) and the I/O circuit
board.
Was there a fault?
yes: BRectify the fault.
Does the error message recur? Æ16
no: Æ16
16. Is the LED on the I/O circuit board flash-
ing?
yes: BReplace I/O card.
Does the error message recur? Æ17
no: BCheck the CANbus connections and power con-
nections.
Does the error message recur? Æ17
17. Control logic 1. Replace I/O circuit board 2. Replace control board
3. Replace transformer circuit board.
Description: Too high pressure in the cooling circuit. Automatic resetting of the pressostat, which must be
acknowledged in the display.
Check Action
Tab. 3
6 720 643 196-02.1I

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2.3.4 High hot gas temperature T6
Description: Compressor temperature too high. Automatic resetting, which must be acknowledged in the dis-
play.
Check Action
1. BStart the heat pump.
BGo to temperatures and look at T6.
BUse a digital thermometer and meas-
ure at the T6 sensor.
Do the values correspond?
yes: Æ2
no: BCheck the attachment of the T6, replace sensor if
necessary.
Does the error message recur? Æ2
2. BGo to temperature display of T10 and
T11.
Is T10 below -5 or delta 5°K or more than
between T10, T11?
yes: BTroubleshoot on the cold side.
no: BHave a refrigeration technician check the cooling
circuit.
Does the error message recur? Æ3
3. BCheck for overheating. Replace expansion valve or compressor if necessary.
Tab. 4
6 720 643 196-03.1I

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6 720 643 196 (2010/02) 11
2.3.5 High forward flow T1
Description: The set value in Max limit heating system temperature +2K.
Check Action
1. BGo to temperatures and look at T1.
BUse a digital thermometer and meas-
ure at the T1 sensor.
Do the values correspond?
yes: Æ2
no: BCheck the attachment of the T1, replace sensor if
necessary.
Does the error message recur? Æ2
2. BStart the heat pump in heating mode
(60 Hz)
BGo to temperatures, check T8 and T9.
Is delta between 7-10°K?
yes: Æ4
no: BCheck that relay HR1 is connected and that G3 has
reached maximum speed.
Does the error message recur? Æ3
3. BCheck the dirt filter on the hot side
and clean it.
Does the error message recur? Æ4
4. BGo to alarm history and check what
the heat pump did when the alarm
was activated.
Did the heat pump produce hot water?
yes: Æ5
no: Æ8
5. BGo to manual operation and activate
the three-way valve.
Does it start?
yes: Æ7
no: Æ6
6. Three-way valve motor defective. BReplace the motor.
7. BRemove the three-way valve motor.
BCheck that the three-way valve goes in
and out easily (use pliers).
Does it move easily?
yes: Æ8
no: BReplace valve/insert.
Does the error message recur? Æ8
Tab. 5
6 720 643 196-04.1I

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6 720 643 196 (2010/02)
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8. BCheck the temp. setting.
BCheck set point value on T1.
Is it higher than 65 °C?
yes: BAdjust the temperature setting.
Does the error message recur? Æ9
no: Æ5
9. BGo to temperatures and check the
value on T2.
BUse a digital thermometer and meas-
ure at the T2 sensor.
Do the values correspond?
yes: Æ10
no: BCheck the cable to T2, it must not be together
with the power cable.
BReplace the sensor if necessary.
Does the error message recur? Æ10
10. Is the room sensor connected? yes: Æ11
no: Æ13
11. BGo to temperatures and check the
value on T5.
BUse a digital thermometer and meas-
ure at the T5 sensor.
Do the values correspond?
yes: Æ12
no: BReplace sensor.
Does the error message recur? Æ13
12. BCheck the settings of the room sensor.
Does the room sensor have a high effect
or set point value?
yes: BAdjust to the permitted values.
Does the error message recur? Æ13
no: Æ13
13. Logic error. BReplace control board.
Does the error message recur?
BReplace I/O card.
Description: The set value in Max limit heating system temperature +2K.
Check Action
Tab. 5
6 720 643 196-04.1I

Rectify interference
6 720 643 196 (2010/02) 13
2.3.6 High temperature difference heating system
water
Description: The temperature difference between T8 and T9 is greater than X, where X is calculated as a linear
function of the compressor frequency. 20Hz=10K and 90Hz=18K.
Check Action
1. BClean the dirt filter on the hot side. BRemove the filter basket and clean it.
Does the error message recur? Æ2
2. BGo to temperatures and check the
value on T8 and T9.
BUse a digital thermometer and meas-
ure at the sensor.
Do the values correspond?
yes: Æ3
no: BCheck the sensors and replace if necessary.
Does the error message recur? Æ4
3. BCheck the flow in the heating system. BCheck that the thermostat valves are open.
Does the error message recur? Æ4
4. The heating system is not sufficiently
large for the relevant heat pump.
BExpand the system volume (volume tank or several
radiators).
Tab. 6
6 720 643 196-05.1I

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2.3.7 Low heat transfer fluid (coll.) in
Description: The heat transfer fluid (coll.) temperature on the incoming heat transfer (coll.) fluid is below the
set protection value (-8 °C). Resets automatically when the temperature has risen 1K.
Check Action
1. BStart the heat transfer fluid (coll.)
pump in the manual operation menu.
BCompare the value on T10 in the info
menu with one from a separate digital
thermometer.
Do the values correspond?
yes: Æ2
no: BReplace sensor T10.
2. Is the value above -7 on T10? yes: Æ3
no: Æ4
3. BReplace control board.
Does the error message recur?
yes: Replace I/O card.
no:
4. There is not enough energy in the heat
absorbing system. This can occur in
extremely cold weather conditions.
Tab. 7
6 720 643 196-06.1I

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6 720 643 196 (2010/02) 15
2.3.8 Low heat transfer fluid (coll.) out
Description: The temperature on the outgoing heat transfer (coll.) fluid is below the set protection value (-
10 °C). Resets automatically when the temperature has risen 1K.
Check Action
1. BCompare the value on T11 in the info
menu with one from a separate digital
thermometer.
Do the values correspond?
yes: Æ2
no: BReplace sensor T11.
2. BPerform a quick start of the compres-
sor when the alarm has reset automat-
ically.
BCheck delta, is it between 1 and 6K?
yes: Æ3
no: Too low flow in the heat transfer fluid circuit.
BIncrease the speed of the heat transfer fluid (coll.)
pump.
BVent the heat transfer fluid circuit for 24 hours.
BClean the particle filter.
BCheck the heat transfer fluid's freezing point.
3. There is not enough energy in the heat
absorbing system. This can occur in
extremely cold weather conditions.
Tab. 8
6 720 643 196-07.1I

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2.3.9 T1-T3, T6-T11
2.3.10 T5
Check Action
1. BCheck the sensor's temperature value
under Temperatures.
Does the display show -52.1 or 160?
yes: Open circuit or short-circuit in the sensor. Æ2
no: Æ3
2. Does the display show -52.1? yes: Open circuit in the sensor or connection
BCheck the wiring to the sensor.
Does the error message recur? Æ3
no: Short circuit in cable or sensor.
BCheck the wiring to the sensor.
Does the error message recur? Æ3
3. BDisconnect the sensor.
BCheck the resistance and compare
with the table.
Do the values correspond?
yes: Æ4
no: BReplace the sensor.
Does the error message recur? Æ4
4. BCheck conductive pathways on the I/O
circuit board.
Are the conductive pathways damaged?
yes: BReplace I/O card.
Does the error message recur? Æ5
no: Æ5
5. BCheck the CANbus connections
between the circuit boards.
Is the wiring OK?
yes: Æ6
no: BReplace the wiring.
Does the error message recur? Æ6
6. Logic error in the control board. BReplace control board.
Tab. 9
Check Action
1. BCheck the sensor in the temperatures
menu.
Does the display show -60 or 160?
yes: Æ3
no: Æ2
2. Is the room sensor tab in the control unit
or does the LED on the room sensor illu-
minate?
yes: Logic error in the control board.
BReplace control board.
no: BCheck the CANbus wiring.
BReconnect.
Does the LED still not illuminate? Æ3
3. Room sensor defective. BReplace the sensor.
Tab. 10
6 720 643 196-08.1I

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2.3.11 T81 (pool control)
Check Action
1. BCheck the sensor's temperature value
under Temperatures.
Does the display show -52.1 or 195?
yes: Open circuit or short-circuit in the sensor. Æ2
no: Æ3
2. Does the display show -52.1? yes: Open circuit in the sensor or connection.
BCheck the wiring to the sensor.
Does the error message recur? Æ3
no: Short circuit in cable or sensor.
BCheck the wiring to the sensor.
Does the error message recur? Æ3
3. BDisconnect the sensor.
BCheck the resistance and compare
with the table.
Do the values correspond?
yes: Æ4
no: BReplace the sensor.
Does the error message recur? Æ4
4. BCheck conductive pathways on the
pool circuit board.
Are the conductive pathways damaged?
yes: BReplace pool circuit board.
Does the error message recur? Æ5
no: Æ5
5. BCheck the CANbus connections
between the circuit boards.
Is the wiring OK?
yes: Æ6
no: BReplace the wiring.
Does the error message recur? Æ6
6. Logic error in the control board. BReplace control board.
Tab. 11
6 720 643 196-09.1I

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2.3.12 Electric element fault
2.3.13 Heat pump now working at max. permitted
temp. (T8)
2.3.14 Electric element now working at max. permit-
ted temp. (T8)
Description: Electric element fault Reset on the overheat protection and must be acknowledged in the display.
Check Action
1. BCheck the supply to the electrical
additional heat (measured on the AHB
circuit board terminals).
Is it OK?
yes: Æ2
no: BCheck the wiring in the heat pump.
2. BTry to reset the overheat protection
again.
Was it successful?
yes: Does the error message recur? Æ3
no: Æ3
3. Overheat protection electric element
defective.
BReplace the AHB board.
Tab. 12
6 720 643 196-10.1I
Description: Value on T8 has exceeded 65 °C.
See fault tracing tree High forward flow
T1. (ÆChapter 2.3.5)
Tab. 13
6 720 643 196-11.1I
Description: Value on T8 has exceeded 75 °C.
See fault tracing tree High forward flow
T1. (ÆChapter 2.3.5)
(Can only occur during additional heat operation).
Tab. 14
6 720 643 196-12.1I

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6 720 643 196 (2010/02) 19
2.3.15 Compressor does not reach correct frequency
2.3.16 Fault in HTF pump G3
2.3.17 High temperature electric box
Description: Gives an alarm if the actual value of the compressor speed deviates by >5Hz for two minutes.
See separate fault tracing tree
(ÆChapter 2.4)
Check the supply to the inverter circuit board in the
molex switch on the I/O circuit board.
Tab. 15
Description: Input Di4 low, delay 2 seconds.
See separate fault tracing tree
ÆChapter 2.6.
Tab. 16
6 720 643 196-13.1I
Description: High temperature on driver circuit board. The temperature is taken from a sensor mounted on the
driver circuit board.
Check Action
1. Is the fan in the electric box running? yes: Æ2
no: BCheck output Do3 on the I/O circuit board.
BReplace fan or I/O circuit board if necessary.
2. If there flow through the cooling coil?
The hoses to the electric box should feel
cold under the insulation.
yes: Does the error message recur? Æ3
no: BOpen the heat transfer fluid circuit and flush
through the cooling coil. Then vent properly.
3. Thermistor in the driver circuit board
defective.
BReplace driver circuit board.
Tab. 17
6 720 643 196-14.1I

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2.3.18 Check connection to AHB
2.3.19 Check connection to I/O circuit board
Description: No contact with AHB board.
Check Action
Is the green LED on the AHB board flash-
ing?
yes: BCheck the CANbus connections and terminations.
no: BCheck the CANbus connections and terminations.
Didn’t that help?
BReplace the AHB board.
Tab. 18
6 720 643 196-15.1I
Description: No contact with I/O circuit board.
Check Action
Is the green LED on the I/O circuit board
flashing?
yes: BCheck the CANbus connections and terminations.
no: BCheck the CANbus connections and terminations.
Didn’t that help?
BReplace I/O card.
Tab. 19
6 720 643 196-16.1I