Sinclair Alpha Inverter Series Manual page 61

(9) Malfunction of Overcurrent Protection E5
5. Malfunction of Overcurrent Protection
Main detection points:
Main detection points:
● Is the supply voltage unstable with big fluctuation?
Is the supply voltage too low with overload?
● Is the supply voltage too low with overload?
Hardware trouble?
● Hardware trouble?
Malfunction diagnosis process:
Malfunction diagnosis process:
Is the supply voltage unstable
with big fluctuation?
Is the supply voltage too low
with overload?
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
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
Is the compressor running
abnormally? Is there abnormal sound or oil
leakage; is the temperature of the shell
Replace the mainboard with
the same model
58
Start
no
no
no
no
Measure the
yes
opened completely)
no
too high, etc.?
no
End
Normal fluctuation should be within 10 % of the
yes
rated voltage on the nameplate
no
Adjust the supply voltage to maintain it within
yes
normal range
no
Clean the indoor and outdoor heat exchangers
yes
and remove the blockage of air inlet and outlet
no
Check the motor and reinstall the motor to have
yes
the fan run normally
no
no Replace the mainboard with the same model
no
Flush the heat exchangers with high pressure
yes
nitrogen
no
yes Replace the compressor
no
Service Manual
Malfunction is
yes
eliminated
Malfunction is Malfunction is
yes
eliminated
eliminated
Malfunction is
yes
eliminated
Malfunction is
yes
eliminated
Malfunction is
yes
eliminated
Malfunction is
yes
eliminated
Malfunction is
yes
eliminated
Installation and Maintenance