13.3.1 Self-Checking of PCBs using Remote Control Switch
The following troubleshooting procedure is utilized for function test of PCBs in the indoor unit and
outdoor unit.
Remote Sensor
Transmission of Central Station
EEPROM
Zero Cross Input Failure
Transmission of Indoor Unit during
This Checking Operation
Transmission of Outdoor Unit
ITO Input Failure
PSH Input Failure
Protection Signal Detection Circuit
Phase Detection
Transmission of Inverter
High Pressure Sensor
Comp. Discharge Gas Temp. Thermistor
Low Pressure Sensor
Heat Exchanger Evaporation Temp. Thermistor
Ambient Air Temp. Thermistor
Intake Air Temp. Thermistor
Discharge Air Temp. Thermistor
Liquid Pipe Temp. Thermistor
Remote Thermistor Abnormality
Gas Pipe Temp. Thermistor
Normal
Abnormality (Open-circuit, Short-circuit, etc.) in circuit for
Indoor
Unit
PCB
Outdoor
Unit
PCB
Contents
Indi-
cation
13.3 Procedure of Checking Each Main Parts
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