Gree IWZA Service Manual page 13

Service Manual
4. Malfunction of Overcurrent Protection E5
Main detection points:
● Is the supply voltage unstable with big fluctuation?
● Is the supply voltage too low with overload?
● Hardware trouble?
Malfunction diagnosis process:
Is the supply voltage unstable
with big fluctuation?
Is the supply voltage too low
Is the indoor / outdoor
heat exchanger dirty,or are the air inlet
and outlet blocked?
The fan is abnormal? Fan
speed is too low or fan doesn't rotate
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 cut off 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,
Replace the mainboard
with the same model
Installation and Maintenance
Start
No
with overload?
No
No
No
Yes
No
etc.?
No
End
Yes
Normal fluctuation should be within 10 %
of the rated voltage on the nameplate
No
Yes
Adjust the supply voltage to maintain it
within normal range
No
Yes
Clean the indoor and outdoor heat
exchangers and remove the blockage
of air inlet and outlet
No
Yes Check the motor and reinstall the
motor to have the fan run normally
No
No
Replace the mainboard with the same
model
No
Yes
Flush the heat exchangers with high
pressure nitrogen
No
Yes
Replace the compressor
Yes
Is malfunction
eliminated
Yes
Is malfunction
eliminated
Yes
Is malfunction
eliminated
Is malfunction Yes
eliminated
Yes
Is malfunction
eliminated
Yes
Is malfunction
eliminated
Yes
Is malfunction
eliminated
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