MrCool DIY-MULTI2-18HP230C Service Manual page 87

Troubleshooting
1. Safety Caution .......................................................................................................3
2. General Troubleshooting ......................................................................................4
2.1 Error Display (Indoor Unit) ..............................................................................4
2.2 Error Display (Outdoor Unit) ...........................................................................6
3. Complain Record Form ..........................................................................................7
4. Information Inquiry ...............................................................................................9
5. Outdoor Unit Point Check Function ...................................................................12
6. Error Diagnosis and Troubleshooting Without Error Code ...............................18
6.1 Remote maintenance ...................................................................................18
6.2 Field maintenance .......................................................................................19
7. Quick Maintenance by Error Code ......................................................................24
8. Troubleshooting by Error Code ...........................................................................27
8.1 EH 00 /EC 51(EEPROM parameter error diagnosis and solution) ...................27
8.2 EL 01 (Indoor and outdoor units communication error diagnosis and solution) 28
8.3 EH 03 / EC 07 (Fan speed is operating outside of the normal range )/EC 71(Over
Current Failure of Outdoor DC Fan Motor) Diagnosis and Solution ...............31
8.4 EH 60/EH 61/EC 53/EC 52/EC 54/EC 56 /(ODU)E4/EC 50 (Open circuit or short
circuit of temperature sensor diagnosis and solution) ...................................33
8.5 PC 08(Current overload protection)/PC 44(Outdoor unit zero speed protection)/
PC 46(Compressor speed has been out of control)/PC 49(Compressor
overcurrent failure) diagnosis and solution ...................................................34
8.6 PC 00(IPM malfunction)&(IDU)PC 04(Inverter compressor drive error diagnosis
and solution) ...............................................................................................36
Contents