MrCool DIY-MULTI2-18HP230C, Service Manual

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 Troubleshooting 4 
2. General Troubleshooting
2.1 Error Display (Indoor Unit)
When the indoor unit encounters a recognized error on different models ,
1. the running LED with flash in a corresponding series, the timer LED may turn on or begin flashing;
2. an error code will be displayed;
3. both 1 and 2.
These error codes are described in the following tables:
Running
Lamp
Timer
Lamp
Display Information Solution
-- --
F
Defrost
Normal
Display, not
error code
-- --
CL
Filter cleaning reminder(power on display for 15 seconds)
-- --
CL
Active clean
-- -- F Filter replacement reminder(power on display for 15 seconds)
-- --
FP
Heating in room temperature under 8°C
-- --
FC
Forced cooling
-- --
AP
AP mode of WIFI connection
-- -- CP Remote switched off
1 time OFF
EH 00
Indoor unit EEPROM parameter error TS27
2 times OFF EL 01 Indoor/outdoor units communication error TS28
3 times OFF
EH 02
Zero-crossing signal detection error(for some models) TS45
4 times OFF
EH 03
The indoor fan speed is operating outside of the normal range TS31
5 times OFF
EC 51
Outdoor unit EEPROM parameter error TS27
5 times OFF
EC 52
Condenser coil temperature sensor T3 is in open circuit or has short
circuited
TS33
5 times OFF
EC 53
Outdoor room temperature sensor T4 is in open circuit or has short
circuited
TS33
5 times OFF
EC 54
Compressor discharge temperature sensor TP is in open circuit or
has short circuited
TS33
5 times OFF
EC 56
Evaporator coil outlet temperature sensor T2B is in open circuit or
has short circuited(for free-match indoor units)
TS33
6 times OFF
EH 60
Indoor room temperature sensor T1 is in open circuit or has short
circuited
TS33
6 times OFF
EH 61
Evaporator coil middle temperature sensor T2 is in open circuit or
has short circuited
TS33
12 times OFF
EC 07
The outdoor fan speed is operating outside of the normal range TS31
7 times FLASH
PC 00
IPM malfunction or IGBT over-strong current protection TS36
2 times FLASH
PC 01
Over voltage or over low voltage protection TS38
3 times FLASH
PC 02
Top temperature protection of compressor or High temperature
protection of IPM module or High pressure protection
TS46
5 times FLASH
PC 04
Inverter compressor drive error TS36
1 time FLASH
PC 08
Current overload protection TS34
7 times FLASH
PC 03
High pressure protection or low pressure protection TS47/TS49
1 times ON -- Indoor units mode conflict(match with multi outdoor unit) --