AUX air conditioner service manual
164
Section two basic faults diagnose process of 18000BTU~24000BTU products
Troubleshooting Guide
1. The Foremost Inspecting Items
⑴The input voltage must be within +10% tolerance of the rated Voltage. If it is not the case, the
air-conditioner will probably not work normally.
⑵ Check the connecting cord between indoor unit and outdoor unit to see if it is properly
connected. The connecting must be done according to the wiring diagram, please also notice that even
different models may have the connecting cord of the same specification.
Please check if the marks at the connecting terminal and the marks on the cord can match,
otherwise, the air-conditioner will not work normally.
If the following phenomena are found, the problem is not from the air⑶ -conditioner itself.
NO. Problems Causes
1 The motor is heard operating but the
air-conditioner dose not work when the
indoor unit is powered on
Since the air-conditioner is powered on, it will
come to working condition as long as you press
the ON/OFF button of the remote control and the
signal is well received.
2 The compressor stops running but the
indoor fan motor keeps working when it
is at cooling mode with the indoor
temperature higher than set temperature.
If you turn off the air-conditioner and restart it
immediately, it will return to normal in 3 minutes,
after that, the air-conditioner will automatically
adjust the indoor fan speed to what you set.
3 The compressor works discontinuously
at dehumidifying mode.
The air-conditioner will automatically control the
working of the compressor according to the inside
temperature
4 The air-conditioner does not work while
the LED display is on.
The TIMER is set with the air-conditioner; it will
be in hold on condition. If the TIMER setting is
cancelled, the air-conditioner will return to normal
working condition.
5 The compressor works discontinuously
at cooling and dehumidifying mode, and
the indoor fan motor slows down.
The compressor stops internally or the fan motor
slows down to prevent the indoor heat exchanger
from being frozen.
2. No Power Display
⑴Items
①Check if the input voltage is correct?
②Check if the AC power supply connecting is correct?
③Check if the output voltage of the manostat L7805(IC2)is correct?
⑵Trouble shooting procedure
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