121
Failure code
Outdoor
digital
display tube:
83
Indoor wired
controller:
53
Indoor unit LED status
LED5 Failure description:
Outdoor unit model are set incorrectly
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Failure diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
conditions
4. Possible causes
◆
BM3-1 / 2/3 dip switch
setting wrong or bad continuity.
Check if the dip switch setting is
correct
Check if the BM3-1 / 2 /3 dip
switch is conduction state
Set the BM3-1 / 2 /3 d ia l
repeatedly to ensure th e
disconnected status
Replace the PCB
Adjusting the setting and r e-
search outdoor and locked
Y
Y
N
N
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