Troubleshooting Guide

Compressor/Outdoor Fan are unable to drive.(9k Model)

Turn on Main Power

Operate "Cooling Mode( )" by setting the desired temperature of the remote controller is less than one of the indoor temperature by 2°F at least.

When in Fan Mode, Compressor/Outdoor Fan is stopped.

Check the sensor for indoor temperature is attached as close as to be effected by the temperature of Heat Exchanger(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 R02H(12.1K), R04H(6.2K), Micom (No.27) (Indoor unit).

• Check the indoor temperature sensor is disconnected or not(About 10k/ at 77°F).

When the temperature around Outdoor PWB Ass'y is above 163°F the compressor is stop and only Outdoor Fan is operating.

Check Relay(RY - COMP) for driving compressor.

When the power(About AC110V) is applied to the connecting wire termi- nal support transferred to compressor, PWB Ass'y is normal.

Check the circuit related to the relay(Outdoor unit).

Check point

COMP ON

COMP OFF

Between Micom(No.

DC5V

DC0V

5) and GND

 

 

 

 

 

Between IC01M, IC02M(No. 9)

Below DC 1V

About DC12V

and IC01M, IC02M(No. 8)

(app)

 

 

 

 

Turn off Main Power

Check the electrical wiring diagram of outdoor side.

Check the abnormal condition for the component of Compressor/Outdoor Fan Motor.

54Room Air Conditioner

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Heat Controller DMH18SB-1, DMC18SB-1, DMC12SB-0, DMC09SB-0, DMH09SB-0 Compressor/Outdoor Fan are unable to drive.9k Model

DMH12SB-0, DMH18SB-1, DMC24SB-1, DMH24SB-1, DMH09SB-0 specifications

The Heat Controller DMC24SB-1, DMH18SB-1, DMH09SB-0, DMH24SB-1, and DMC18SB-1 are a series of high-efficiency air conditioning systems designed to meet diverse climate control needs. Each model is equipped with advanced technologies to ensure optimal performance, energy efficiency, and user comfort.

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