Toshiba MMK-AP0072H Service Manual page 85

Check code name
[H16] / [d7]
(Current code / AI-NET)
Is not TK2 sensor detached?
NO
Is there no miscabling or misinstallation
on TK1/TK2/TK3/TK4 sensors?
NO
Are characteristics of TK2 sensor
resistance value normal?
YES
Does OCR of MG-SW operate?
NO
After power reset
Start a test operation in COOL or HEAT mode.
TK2 sensor temp is displayed on 7-segment display with SW01/02/03=[1] [12] [2].
Check TK2 sensor temp approx. 10 minutes after compressor 2 has operated.
If low temperature continues (approximately outside temp) or temperature
does not almost change, a clogging of strainer of oil-equalization circuit,
clogging of capillary, or malfunction of check valve is considered.
No error
Check the clogging of SV3E valve.
(*1)
No error
Check I/F P.C. board
Check code name
Oil level detective circuit system error
(Sub-code: 02)
YES
YES
NO
* Outdoor unit temp sensor characteristics-4
YES
Error
*1 Refer to item [H07] error.
*2 If OCR operates even after manual reset of OCR, check whether the wiring to the
current sensor (TO2) of Comp-IPDU is correct or not.
1. Detachment of TK2 sensor, miscabling,
characteristics error of resistance value
2. Oil-equalization circuit error
(Check valve, capillary clogging,
strainer clogging)
3. Refrigerant stagnation in compressor
shell
Error
Capillary tube
Oil tank
Replace SV3E valve.
85
FILE NO. SVM-05052
Cause of operation
Correct installation of sensor.
Correct miscabling/misinstallation.
TK1: CN514
( )
TK2: CN515
TK3: CN516
TK4: CN523
Sensor error
Reset OCR manually.(*2)
Replace clogging part.
Compressor 2
Strainer
TK2