Haier Arc Series Service Manual page 52

7.service diagnosis
7.1.caution for diagnosis
1. The operation lamp flashes when any of errors is detected.
2. when a protection device of the indoor or outdoor unit is activated or when the thermistor
malfunctions, disabling equipment operation.
7.2.Problem Symptoms and Measures
Sympt m Check Item
None of the Check the power supply.
units operates
Check the indoor PCB
Equipment Diagnosis by service
operates but port pressure and
does not cool, operating current.
or does not
heat (only for
heat pump)
Large Check the installation
operating condition.
noise and
vibrations
7.3 Trouble Shooting
7.3.1 error code description
Power timer operate
Indoor Malfunction
explanation
The code indication that is listed above is the main fault
HSU-24C03/Z HSU-24H03/Z
Details of Measure
Check to make sure that the rated voltage is
supplied.
Check to make sure that the indoor PCB is
broken
Check for insufficient gas.
Check to make sure that the required spaces
for installation (specified in the Technical Guide,
etc.) are provided.
Code indication
on flash off
Description
Room temperature sensor
failure
Heat-exchange sensor failure
Indoor fan motor malfunction
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Service Diagnosis
Reference
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Domestic Air Conditioner