General Troubleshooting; Error Display (Indoor Unit) - MrCool DIY-MULTI2-18HP230C Service Manual

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