Haier MRV 5 Series Troubleshooting Manual page 188

Method 2:
Check the indoor PCB LED lamp
1. Malfunction lamp LED5 (for console unit is LED1), This lamp not light under normal condition; once indoor
unit occurs malfunction this lamp will flicker, flicker times indicate the corresponding failure code.
2. Communication lamp LED3 and LED4: They should flash alternatively very fast, if they are both OFF or ON
or they are flashing together slowly, it means that the indoor have no communication with outdoor
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