Haier AS25THMHRA-C, Service Manual

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Functions and control
19 Domestic air conditioner
7.1.11 Low load protection control
In order to prevent the frosting of the indoor heat interaction device, the outdoor system will be
stopped if the indoor heat interaction temperature is below 1
ć
centigrade for 5 minutes, but the fan
will continue to operate. The outdoor system will be started again when the heat interaction
temperature is above 9 centigrade and the system has been stopped for 3 minutes. The malfunction
will be stored in the malfunction resume and will not be revealed
7.1.12 High load protection control
The outdoor system will be stopped if the coil temperature is above 63
ć
for 2 minutes. The indoor
fan will be controlled by the thermostat. The outdoor system can be restarted when the coil
temperature is below 45
ć
and the system has been stopped for 3 minutes. The malfunction will be
stored in the malfunction resume and will not be revealed.
7.1.13 Abnormal operation of indoor system
When the outdoor system operates, if the indoor system operation differs from the outdoor system,
the abnormal operation malfunction will be reported. 10s after the report, the indoor system will be
closed.
Outdoor system mode Indoor system mode conflicts
cooling heating yes
cooling cooling no
cooling airflow no
heating heating no
heating airflow yes
heating cooling yes
7.1.14 Malfunction list resume.
Nothing is presented if there is no code list.
The malfunction display will automatically finish in 10 seconds.
The remote control only receives the signals for stop. According to the signals, the malfunction
resume presentation finishes.
The resume restores after the power supply restores.
7.1.15 Abnormality confirmation approaches
1. indoor temperature sensor abnormality:
Under the operation, the normal temperature ranges from 120 degree to -30 degree. When the
temperature goes beyond this range, the abnormality can be confirmed. If the temperature goes back
into the range, the system will automatically resume.
2 .indoor heat interaction sensor abnormality:
Under the operation, the normal temperature ranges from 120 degree to -30 degree. When the