Troubleshooting
Diagnostic Procedure for Check Code
81
14
Check code
Operation cause
1. Ps sensor error
[b4]
2. Ps sensor connection error
Ps sensor alarm
3. Compressor error
Are Pd sensor/Ps sensor
correctly connected
?
Are the output voltage
characteristics of Ps sensor
normal
?
Check connection.
Pd sensor: CN501
Ps sensor: CN500
Check compressor.
Check indoor P.C. board.
If defective, replace.
Check external device.
If defective, replace.
Sensor error
Yes
No
No
Yes
Is the low-pressure below
0.95MPa during operation of
compressor
?
No
Yes
Check interface P.C. board.
[
]
Check code
Operation cause
[b5]
Indoor outside input alarm
1. External device error
[b6]
2. Indoor P.C. board error
Indoor outside interlock
Is the external device connected
to connector CN17
?
Yes
No
Is the external device
operating normally
?
No
Yes
Check cause of the operation.
Check code
Operation cause
[b9]
Output voltage error of indoor pressure sensor
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.
Summary of Contents for MM-A0160HX
Page 1: ...Service Manual Air Conditioner Multi Split Type System Modular Multi System HFCR407C A90 0130 ...
Page 2: ......
Page 133: ...134 20 Additional Literature and Contacts ...
Page 134: ...135 20 Additional Literature and Contacts ...
Page 135: ...TOSHIBA AIR CONDITIONING www toshiba aircon co uk MADE IN UK A90 0130 Revised April 2001 ...
