Hitachi RAS-8FSXN - Checking Procedures for each Main Part; Self-Checking of PCB Using the Remote Control

8.7 Checking procedures for each main part
8.7.1 Self-checking of PCB using the remote control
The following troubleshooting procedure is used for carrying out function test of the indoor and outdoor unit PCBs.
Stop Operation
Simultaneously depress
two switches for 3 seconds.
Press
TEMP
RUN/STOP
(ex.) Indication of Unit No. "1"
CHECK
Ambient Air Temp. Thermistor
ADDS. RN
PCB Check Mode
Indication of
Unit Number
Operating Automatic
PCB Check
Abnormality (3)
Abnormality (1)
After Approx. 5 sec. (Max. 30 sec. in
case of
tr
ansmission failure between
indoor unit and outdoor unit)
Max. 3 Types of Abnormalities indicated.
Result
After
1 Second
After
7 Seconds
After
1 Second
After
1 Second
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Contents
Abnormality (2)
Heat Exchanger Evaporation Temp. Thermistor
Low Pressure Sensor
Comp. Discharge Gas Temp. Thermistor
High Pressure Sensor
Transmission of Inverter
Phase Detection
Protection Signal Detection Circuit
PSH Input Failure
ITO Input Failure
Transmission of Outdoor Unit
This Checking Operation
Transmission of Indoor Unit during
Zero Cross Input Failure
EEPROM
Transmission of Central Station
Remote Sensor
Gas Pipe Temp. Thermistor
Remote Thermistor Abnormality
Liquid Pipe Temp. Thermistor
Discharge Air Temp. Thermistor
Intake Air Temp. Thermistor
Abnormality (Open-circuit, Short-circuit, etc.) in circuit for
Indoor
Unit
PCB
Outdoor
Unit
PCB
Normal
Contents
Indi-
cation
RUN/STOP
TEMP
MODE
LOUVER CHECK
TIME
FAN SPEED
RESET
VENT
ON/OFF TIMER
8 Troubleshooting
262
SMGB0065 rev. 1 - 12/2010