52
Installation and Maintenance
Service Manual
5. Overcurent protection (E5)
Start
Start
no
no
no
no
yes
no
no
End
yes
no
yes
yes
no
yes
no
no
no
yes
no
yes
no
yes
yes
yes
yes
yes
yes
yes
Is the supply voltage unstable
with big fluctuation
Is the supply voltage too low
with overload?
Is the indoor /
outdoor heat exchanger
too dirty
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 panel
Replace the compressor
Flush the heat exchangers with high
pressure nitrogen Malfunction
Replace the controller
Check the motor and reinstall the
motor to have the fan run normally
Clean the indoor and outdoor heat
exchangers and remove the
blockage of air inlet and outlet
Adjust the supply voltage to
maintain it within normal range
Normal fluctuation is within 10% of
the rated voltage on the nameplate
Malfunction
is eliminated.
Malfunction
is eliminated.
Malfunction
is eliminated.
Malfunction
is eliminated.
Malfunction
is eliminated.
Malfunction
is eliminated.
Malfunction
is eliminated.
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