10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
292
Restart Operation
Yes
Yes
Does alarm code
display immediately
after compressor started
operation?
Check if compressor wirings are
connected reversely?
Is electric reactor wiring secure?
Driver board is damaged,
replace the driver board
No
Replace compressor, if
faulty
No
Yes
Is electric reactor wiring loose?
Fasten the wiring
Is the power supply voltage within
the range of the rated voltage?
No
Yes
No
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
No
No
No
Is the power supply voltage higher
than 85% of the rated voltage during
operation?
Check the power supply voltage,
remove the fault to avoid the
voltage too low or too high
Is there any other high-power
equipment starting during the
operation?
Is the power voltage higher than 85%
of the rated voltage?
Is crankcase heater ON?
Restart operation after the
crankcase heater is ON for
8 hours
Is refrigerant overcharged?
Correct refrigerant charging
amount
Is electronic expansion valve of
outdoor unit locked?
Replace electronic expansion
valve
Check compressor
Is the pressure too high?
Check if the electronic
expansion valve and stop
valves are not open.
Check if the heat exchanger
is blocked or the fan motor of
outdoor unit is not running.
Yes
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