128
Failure code
Outdoor
digital
display tube:
114-4, 5
Indoor wired
controller:
72
Indoor unit LED status
LED5 Failure description:
Fan motor module DC BUS under 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 the power supply
voltage is too low , resulting
in reduced voltage after
◆
Check if the PTC is in
normal conditions;
◆
Check if the cabinet is
correctly wired .
conditions
When the power voltage
<DC283V, fault and alarm.
Voltage> DC283V, the
motor built-in control panel
automatically restored
4. Possible causes
◆
Incorrect wiring may result
in under voltage alarm;
◆
PTC or SCR damage may
result in under voltage;
◆
Low power voltage may
result in under voltage.
Check i f the supply voltage is normal
and the cabinet is wired correctly.
Check if the PTC and SCR is
damaged.
When the fan running, testing the
DC voltage between DC + (red
line), DC- (white line) if it less
than 283?
Check t he r ectifier bridge ,
reactor, electrolytic capacitor
of inverter main circuit
Replace the compressor module
Replace the fan motor
Adjust t he supply voltage o r
rewire the cabinet in accordance
with circuit diagram.
Y
Y
Y
N
N
N
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