129
Failure code
Outdoor
digital
display tube:
115-0, 1
Indoor wired
controller:
73
Indoor unit LED status
LED5 Failure description:
Compressor module DC BUS over voltage
20 times
Outdoor unit LED status
LED1L ED2
Normal Normal
1. Model Failure diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Check if the power voltage
is too high and results in over
◆
Check if the cabinet is
correctly wired.
conditions
Raise failure alarm when
power voltage>DC642V.
INV control board recovers
automatically when voltage
<DC642V.
4. Possible causes
◆
Incorrect connection may
result in over voltage alarm;
◆
High power voltage may
result in over voltage.
Check if the supply voltage is normal.
Check if the cabinet is wired correctly.
Test if the voltage of DC bus is above 642V.
Replace and c ompare t he
neighboring electrical cabinet
by troubleshooting.
Rewire t he cabinet in a ccordance
with wiring diagram.
The detection circuit of variable
frequency board is damaged .
Replace the board.
Adjust the supply voltage.
Y
Y
Y
N
N
N
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