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Wall Mounted Multi-Zone Split System Air Conditioner
Troubleshooting Guide
Turn on the main power.
When in air circulation mode, compressor/outdoor fan is stopped.
Turn off main power.
Check the electrical wiring diagram of Outdoor side.
Check the open or short of connecting wires between Indoor and Outdoor.
Check that the sensor for Indoor temperature is attatched and as close as to the Heat
Exchanger (Evaporator.)
When the sensor circuit for Indoor temperature and connector have a bad connection or are
not engaged, Compressor/Outdoor fan is stopped.
• Check the related circuit of R01H(1K), R02H(1K), R03H(1K), R04H(1K), Micom(pin No. 74 ,
75 , 76 , 77 ).
• Check that the Indoor temperature sensor is disconnected (about 10K at 25°C(77°F)).
Check the Relay(RY-PWR, RY-START) for driving Compressor.
• Check the voltage between brown and blue cable of terminal which connects to the Outdoor unit
(About AC208V / 230V).
• Check the Outdoor PCB Assembly's relay circuit.
Operate Cooling Mode by setting the disired temperature of the remote controller to less
than one of the Indoor temperature by 1°C(33.8°F) at least.
The Compressor/Outdoor Fan don't operate
Trouble 3
Check Point
Between Micom(No. 50,51) and
GND
DC 5V DC 0V
DC 12VDC 1V↓
Between IC01M(No. 10) and
GND
Comp. ON Comp. OFF