10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
288
Restart Operation
Yes Ye s
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.
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