Gree GWH18PD-K3NNA1A Service Manual page 46

Troubleshooting
(4)E5 Malfunction
Start
Is the supply voltage unstable with big fluctuation?
Is the supply voltage too low with overload?
Is the indoor / outdoor heat exchanger too dirty,
or are the air inlet and outlet blocked?
Is the fan motor running abnormally; is the fan speed too
low or does it fail to run?
Measure the current of live wire
on the main board with a clamp ampere meter. Is the
current higher than the value of the overcurrent
protection?
Is there blockage inside the system?
(Filth blockage, ice plug, greasy blockage, the Y-valve hasn' t
been opened completely)
Is the compressor running
abnormally? Is there abnormal sound or oil leakage; is
the temperature of the shell too high, etc.?
Replace the control
yes
no
yes
no
yes
no
yes
no
no
yes
yes
no
yes
no
panel
End
Normal fluctuation is within 10% of the rated voltage on the
nameplate
no
Adjust the supply voltage to maintain it within normal range
no
Clean the indoor and outdoor heat exchangers and remove
the blockage of air inlet and outlet
no
Check the motor and reinstall the motor to have the fan run
normally
no
Replace the controller
no
Flush the heat exchangers with high pressure nitrogen
no
Replace the compressor
no
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
yes
Malfunction is eliminated.
43