Hitachi PC-ARF Technical Catalogue page 171

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Table of Contents

4 Individual remote controls

After 5 seconds (maximum 30s in the event of a transmission failure between the indoor and outdoor units):

The display will indicate a maximum of 3 types of FAULTS.

Abnormal operation condition (1)

After 1 second

Abnormal operation condition (2)

After 1 second

Abnormal operation condition (3)

Air inlet temperature thermistor

Discharge air temperature thermistor

Liquid piping temperature thermistor

Abnormal remote thermistor

Liquid piping temperature thermistor

Remote sensor

Transmission from central station

Zero-cross input fault

Transmission from indoor units during check

Transmission from outdoor unit

Fan inlet internal thermostat fault

PSW input fault

PSH protection signal detection circuit

Phase detection

Transmission from inverter

High pressure sensor

Discharge gas temperature thermistor of the compressor

Low pressure sensor

Heat exchanger evaporation temperature thermistor

Ambient air temperature thermistor

TCGB0106 rev.0 - 12/2014

(continued from the previous page)

Action required

Types of abnormal condition

Abnormal condition (open circuit, short-circuit, etc.) on a circuit for:

(continued on next page)

Indoor unit PCB

Outdoor unit PCB

Troubleshooting