Table of Contents
Advertisement
Diagnostic Procedure for Check Code
Check code
[b4]
Ps sensor alarm
Are Pd sensor/Ps sensor
correctly connected?
Yes
Are the output voltage
characteristics of Ps sensor
normal?
Yes
Is the low-pressure below
0.95MPa during operation of
compressor?
Yes
Check interface P .C. board.
Check code
[b5]
Indoor outside input alarm
[b6]
Indoor outside interlock
Is the external device connected
to connector CN17?
Yes
Is the external device
operating normally?
Yes
Check cause of the operation.
Check code
[b9]
Indoor pressure sensor alarm
There is an abnormal output voltage of indoor pressure sensor. Check connector (CN23)
and output voltage of the sensor.
If the sensor is normal, replace the indoor P .C. board.
Troubleshooting
1. Ps sensor error
2. Ps sensor connection error
3. Compressor error
No
No
No
1. External device error
2. Indoor P .C. board error
No
No
Output voltage error of indoor pressure sensor
81
Operation cause
Check connection.
[
Pd sensor: CN501
Ps sensor: CN500
Sensor error
Check compressor.
Operation cause
Check indoor P .C. board.
If defective, replace.
Check external device.
If defective, replace.
Operation cause
]
14
Hide quick links:
Advertisement
Table of Contents
