Hitachi RAS-(4-12)HNP(1)(E) - Self-Checking Procedure of PCB by Means of the Remote Control Switch

8 Troubleshooting
283
SMGB0087 rev.0 - 12/2013
8
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Self-checking procedure of PCB by means of the Remote Control Switch
Use the following troubleshooting procedure for testing the PCB in the indoor unit and the outdoor unit:
Stop operation
PCB check mode
Press
Press both switches
for three seconds
Indication of unit number
Operating automatic
PCB check
(ex.) Indication of unit No. “0”
After 7 seconds
After approx 5 seconds (max 30 seconds in case of
a transmission failure between the indoor unit and
the outdoor unit).
Max three types of abnormal operations indicated.
Abnormal operation (1)
After 1 second
Abnormal operation (2)
After 1 second
Abnormal operation (3)
After 1 second
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Indi-
cation
Contents
00
Normal
Abnormality (open-circuit, short-circuit, etc.) in circuit for:
01
Air inlet temperature thermistor
Indoor unit PCB
02
Discharge air temperature thermistor
03
Liquid pipe temperature thermistor
04
Remote thermistor abnormality
05
Gas pipe temperature thermistor
06
Remote sensor
08
Transmission of central station
0A
EEPROM
b
Zero cross input failure
EE
Transmission of indoor units during this
checking operation
07
Transmission of outdoor unit
Outdoor unit PCB
4
Internal thermostat fan input failure
5
PSW input failure
6
PSH protection signal detection circuit
7
Phase detection
8
Transmission of inverter
A
High-pressure sensor
b
Compressor discharge gas temperature
thermistor
C
Low-pressure sensor
d
Heat exchanger evaporation temperature
thermistor

Ambient air temperature thermistor