Haier MRV5-H - Page 121

118
Failure code
Outdoor
digital
display tube:
74
Indoor wired
controller:
4A
Indoor unit LED status
LED5 Failure description:
Emergency stop function switch failure
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Diagnosis and troubleshooting
MRV 5-HR series
Diagnosis Troubleshooting
2. Abnormity detection method
◆
Check if the CN18 is open
circuit
conditions
4. Possible causes
◆
CN18 is open circuit
Short circuit the CN18
If the PCB CN18 is short
circuit
N