MrCool DIY E Star Series User manual

Due to updates and constantly improving performance, the information and instructions
within this manual are subject to change without notice. Please visit
www.mrcool.com/documentation to ensure you have the latest version of this manual.
Version Date: 10-22-21
Troubleshooting &
Solutions Guide
DIY® E Star™
4th Generation
Series

Contents
1. Safety Caution .......................................................................................................3
2. General Troubleshooting......................................................................................4
3. Complain Record Form..........................................................................................6
4. Information Inquiry ...............................................................................................8
5. Error Diagnosis and Troubleshooting Without Error Code...............................11
5.1 Remote maintenance...................................................................................11
5.2 Field maintenance.......................................................................................12
6. Quick Maintenance by Error Code......................................................................17
7. Troubleshooting by Error Code...........................................................................18
7.1 EH 00 / EC 51 (EEPROM parameter error diagnosis and solution)...........18
7.2 EL 01 (Indoor and outdoor unit communication error diag. and solution).. 19
7.3 EH 02 (Zero-crossing detection error diagnosis and solution). ................... 21
7.4 EH 03 / EC 07 (Fan speed is operating outside of the normal range
diagnosis and solution) .............................................................................. 22
7.5 EH 60/EH 61/EC 53/EC 52/EC 54/EC 56 (Open circuit or short circuit of
temperature sensor diagnosis and solution)............................................... 25
7.6 EH 0b (Indoor PCB / Display board communication error diagnosis and
solution) ..................................................................................................... 26
7.7 EL 0C (Refrigerant Leakage Detection diagnosis and solution) ................ 27
Troubleshooting

Contents
7.8 PC 08 (Overload current protection diagnosis and solution) .................... 28
7.9 PC 00 (IPM malfunction or IGBT over-strong current protection diagnosis
and solution) ............................................................................................. 29
7.10 PC 01 (Over voltage or too low voltage protection diag. and solution)...... 30
7.11 PC 02 (High temperature protection of IPM module or high pressure
protection diagnosis and solution) ............................................................ 31
7.12 PC 04 (Inverter compressor drive error diagnosis and solution)............... 33
7.13 PC 03 (Low pressure protection diagnosis and solution).......................... 34
8. Check Procedures.. ............................................................................................. 36
Troubleshooting

Troubleshooting 3
1. Safety Caution
WARNING
Be sure toturn off all power supplies or disconnect all wires to avoidelectric shock.
While checking indoor/outdoor PCB, pleaseequip oneself with anti-static gloves or wrist
strap to avoid damage to the board.
WARNING
Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.
Test the voltage between P and N on back of the main PCB with multimeter. If the voltage is lower than 36V, the
capacitors are fully discharged.
Note: This picture is for reference only. Actual appearance may vary.

Troubleshooting 4
2. General Troubleshooting
2.1 Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, the operation lamp will flash in a corresponding series, the timer
lamp may turn on or begin flashing, and an error code will be displayed. These error codes are described in the following
table:
Operation
Lamp
Timer
Lamp
LED
Display Error Information Solution
1 time OFF EH 00 Indoor unit EEPROM parameter error TS18
2 times OFF EL 01 Indoor /outdoor unit communicationerror TS19
3 times OFF EH 02 Zero-crossing signal detection error (for some models) TS21
4 times OFF EH 03 The indoor fan speed is operating outside of the normal range TS22
5 times OFF EC 51 Outdoor unit EEPROM parameter error (for some models) TS18
5 times OFF EC 52 Condenser coil temperature sensor T3 is in open circuit or has short
circuited TS25
5 times OFF EC 53 Outdoor room temperature sensor T4 is in open circuit or has short
circuited TS25
5 times OFF EC 54 Compressor discharge temperature sensor TP is in open circuit or
has short circuited TS25
5 times OFF EC 56 Evaporator coil outlet temperature sensor T2B is in open circuit or
has short circuited (for free-match indoor units) TS25
6 times OFF EH 60 Indoor room temperature sensor T1 is in open circuit or has short
circuited TS25
6 times OFF EH 61 Evaporator coil temperature sensor T2 is in open circuit or has short
circuited TS25
12 times OFF EC 07 The outdoor fan speed is operating outside of the normal range
for some models)TS22
9 times OFF EH 0b Indoor PCB / Display board communication error TS26
8 times OFF EL 0C Refrigerant leak detected TS27
7 times FLASH PC 00 IPM malfunction or IGBT over-strong current protection TS29
2 times FLASH PC 01 Over voltage or over low voltage protection TS30
3 times FLASH PC 02 High temperature protection of IPM module or High pressure
protection (for some models) TS31
5 times FLASH PC 04 Inverter compressor drive error TS33
1 time FLASH PC 08 Current overload protection (for some models) TS28
7 times FLASH PC 03 Low pressure protection (for some models) TS34
1 times ON -- Indoor units mode conflict (match with multi outdoor unit) --

Troubleshooting 5
For other errors:
The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a
temperature reading.
Troubleshooting:
Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement.
If the unit responds, the display board requires replacement.
LED flash frequency:
... ...
2.2 Error Display (For Some Outdoor Units)
There are 2 LED lights (RED color and GREEN color) welded in outdoor main board. After power on, LED show different
actions when encounter different problems.
No. Problem LED(GREEN) LED(RED) Solution
1 Standby normally ON OFF -
2 Operate normally OFF ON -
3 Compressor driven chip EEPROM parameter error ON FLASH TS19
4 IPM malfunction or IGBT over-strong current protection Flash OFF TS30
5 Over voltage or too low voltage protection ON ON TS31
6 Inverter compressor drive error OFF FLASH TS34
7 Inverter compressor drive error Flash LIGHT TS34
8Communication error between outdoor main chip and
compressor driven chip flash FLASH TS19

Troubleshooting 6
3. Complain Record Form
Complain Record Form
Request No.: Date:
Installation Date: Service Date:
Customer Information
Name Telephone No.
Home Address
Email
Product Information
Indoor Unit Model Outdoor Unit Model
Serial No. of indoor unit
Serial No. of outdoor unit
Working Mode □Cooling □Heating □Fan only □Dry
Setting temperature °C / °F Fan speed □Turbo □High □Medium □Low
□Auto
Temperature of air inlet °C / °F Temperature of air
outlet °C / °F
Installation / Condition Information
Indoor temperature °C / °F Indoor humidity %RH
Outdoor temperature °C / °F Outdoor humidity %RH
Length of Connecting pipe Pipe diameter Gas pipe: Liquid pipe:
Length of Wiring wire diameter
System Running Pressure MPa or Bar or PSI
Room size (L*W*H)
Photo of Installation of In-
door unit
(Photo #1)
Photo of Installation
of Outdoor unit
(Photo #2)
Failure Description
Error Code of Indoor unit Code of Outdoor
PCB
Unit does not start
Remote control does not work
Indoor display shows nothing
No cooling or heating at all
Less cooling or heating
Unit starts but stops shortly
High noise
High vibration

Troubleshooting 7
Parameter Checking information by Remote controller
Displaying code Displaying code meaning Display value Display value meaning
T1 Room temperature
T2 Indoor coil temperature
T3 Outdoor coil temperature
T4 Ambient temperature
Tb Outlet temperature of
indoor coil
TP Discharge temperature
TH Sunction temperature
FT Targeted Frequency
Fr Actual Frequency
IF Indoor fan speed
OF Outdoor fan speed
LA EXV opening steps
CT Compressor continuous
running time
ST Causes of compressor
stop.
A0, A1, b0, b1, b2, b3, b4,
b5, b6, dL, Ac, Uo, Td, dA,
dS, dT
Reserved
Approval from Manufacturer
□Approved
□More Proof needed
□Rejected

Troubleshooting 8
4. Information Inquiry
• To enter information inquiry status, complete the following procedure within ten seconds:
• Press LED (or DO NOT DISTURB)
3 times.
• Press SWING (or AIR DIRECTION) 3 times.
• Finish 1 and 2 within 10 seconds, you will hear beeps for two seconds, which means the unit goes into parameter
checking mode.
• Use the LED (or DO NOT DISTURB) and SWING (or AIR DIRECTION) buttons to cycle through information displayed.
• Pressing LED (or DO NOT DISTURB) will display the next code in the sequence. Pressing SWING (or AIR
DIRECTION) will show the previous.
• The following table shows information codes. The screen will display this code for two seconds, then the information
for 25 seconds.

Troubleshooting 9
Displayed code Explanation Displayed
value Meaning Additional Notes
T1
T2
T3
T4
Tb
TP
TH
FT
Fr
Room temperature
-1F,-1E,-1d,-1c,-
1b,-1A
-19—99
A0,A1,…A9
b0,b1,…b9
c0,c1,…c9
d0,d1,…d9
E0,E1,…E9
F0,F1,…F9
-25,-24,-23,-22,
-21,-20
-19—99
100,101,…109
110,111,…119
120,121,…129
130,131,…139
140,141,…149
150,151,…159
1. All displayed temperatures
use actual values.
2. All temperatures are
displayed in °C regardless
of remote used.
3. T1, T2, T3, T4, and T2B
display ranges from -25 to
70 °C. TP display ranges
from -20 to 130 °C.
4. The frequency display
ranges from 0 to 159HZ.
5. If the actual values exceed
or fall short of the defined
range, the values closest
to the maximum and
minimum values will be
displayed.
Indoor coil
temperature
Outdoor coil
temperature
Ambient
temperature
Outlet temperature
of indoor coil
Discharge
temperature
Suction temperature
Targeted frequency
Actual frequency
IF Indoor fan speed
0
1,2,3,4
14-FF
OFF
Low speed, Medium
speed, High speed,
Turbo.
Actual fan speed is
equal to the display
value converted to
decimal value and
multiplied by 10. This
is measured in RPM.
N/A
Used for some large capacity
motors.
Used for some small capacity
motors.
The display value is 14-FF
(hexadecimal). The
corresponding fan speed
ranges from 200 to 2550 RPM.
OF Outdoor fan speed
LA EXV opening angle 0-FF
Actual EXV opening
value is equal to
the display value
converted to decimal
value and then
multiplied by2.
-
CT
Compressor
continuous running
time
0-FF 0-255 minutes
If the actual value exceeds
or falls short of the defined
range, the value closest to the
maximum and minimum will
be displayed.
ST Causes of
compressor stop 0-99
For a detailed
explanation, contact
technical support.
-