124
Failure code
Outdoor
digital
display tube:
111-0, 1
Indoor wired
controller:
6F
Indoor unit LED status
LED5 Failure description:
Compressor out of control
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 if the module is in
normal conditions and if P and
N is short-circuited to U, V and
W; Measure with diode to see if
there is a voltage drop between
P/N and U/V/W.
◆
Check if the module is
dissipation is good;
◆
Check if the compressor
winding is normal.
◆
Check if the compressor
wiring UVW is connected
correctly and the inverter board
and module board is securely
wired.
conditions
Over current of module
hardware
4. Possible causes
◆
The module alarms failure
as it broke down;
◆
Liquid shock is found in
compressor which results in
over current upon starting or
operating;
◆
The compressor winding is
burned out;
◆
UVW wiring is wrongly
connected or the inverter board
and module board are wired
insecurely.
Check if the supply voltage is normal
Check if the electrical cabinet and
compressor wires are secured, the
UVW is c orrectly connected a nd
the variable frequency board and
module board are wired correctly.
Check i f the PWM signal s
from 6 channels o n variable
frequency control board and
IPM driver board are normal.
Check if the power module is normal
Check if the compressor, resistance
and insulation are normal
The compressor is overloading
and check for the causes.
Replace on s ite b y after-sale s
personnel.
Replace on s ite b y after-sale s
personnel.
Replace the variable frequency
control board.
Replace the power module.
Replace the compressor.
Y
Y
Y
Y
Y
N
N
N
N
N
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