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Haier MRV 5 Series Troubleshooting Manual page 142

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Indoor unit 50Hz
Zero-crossing failure
Central controller display
BMS display
Indication on
wired controller (hex)
Indoor PCB LED
139
12
YCZ-A004
12
HCM-05
12
HCM-01A
0C
YR-E17
Flash 12 times

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