137
Failure code
Outdoor
digital display
tube:
123-0, 1
Indoor wired
controller: 78,
7B
Indoor unit LED status
LED5 Failure description:
Hardware instantaneous over current of the
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
◆
Check the module is normal,
there is short circuit between P,
N, U, V, W
◆
Check whether the module
good;
◆
Check the compressor
resistance is normal,
◆
Check if the wiring of
compressor UVW is correct,
frequency converter board and
module board connection is
reliable.
conditions
Hardware instantaneous over
side
4. Possible causes
◆
Poor radiating caused the
module burned;
◆
The module is punctured to
cause a breakdown;
◆
Compressor winding
resistance too large
◆
UVW wiring short circuit, or
compressor line short circuit to
ground
◆
The compressor has a liquid
shock, causing starting current
or operating current too high
Check if the supply voltage is normal
Check if the electrical box connect
correctly, compressor wires connect
reliably
Check if the inverter module is normal
If the resistance, insulation of the
compressor is normal
Solve the failure
Reconnect o r re-fix i t in
accordance with c ircuit
diagram.
Replace the inverter module
Replace the compressor
Adjust the power supply.
Y
Y
Y
Y
N
N
N
N
If there are other failures 112,114
Y
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