Heat Controller DMH18DB-1 The Compressor/Outdoor Fan are dont operate, Trouble, Service Manual

Troubleshooting Guide

Trouble 3 The Compressor/Outdoor Fan are don't operate

Turn on the main power.

Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1°C at least.

When in air circulation mode, compressor/outdoor fan is stopped.

Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange (EVA.)

When the sensor circuit for Indoor temperature and connector are in 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 the Indoor temperature sensor is disconnected or not (about 10K at 25°C).

Check the Relay(RY-PWR, RY-START) for driving Compressor.

•Check the voltage between brown and blue cable of terminal to connect the Outdoor (About AC208V / 230V).

•Check the related circuit of relay in Outdoor PCB Ass'y.

Check Point	Comp. ON	Comp. OFF
Between Micom(No. 50,51) and	DC 5V	DC 0V
GND
Between IC01M(No. 10) and	DC 1V↓	DC 12V
GND

Turn off main power.

Check the electrical wiring diagram of Outdoor side.

Check the open or short of connecting wires between Indoor and Outdoor.

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