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Contents

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

Troubleshooting

MrCool DIY-MULTI5-48HP230C User Manual

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