Toshiba MMD-AP0071SH-C Service Manual page 95

Check code name Check code name
[H16] / [d7] Oil level detective circuit system error
(Sub-code: 02)
(d07 / AI-NET)
YES
Is not TK2 sensor detached?
NO
YES
Is there no miscabling or misinstallation
on TK1/TK2/TK3/TK4 sensors?
NO
NO
Are characteristics of TK2 sensor
resistance value normal?
Outdoor unit temp sensor characteristics-4
YES
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
Error
Check the clogging of SV3E valve.
(*1)
1 Refer to item [H07] error.
No error
Check I/F P.C. board
2 If OCR operates even after manual reset of OCR, check whether the wiring to the
current sensor (T02) of Comp-IPDU is correct or not.
Cause of operation
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
Correct installation of sensor.
Correct miscabling/misinstallation.
TK1: CN514
( )
TK2: CN515
TK3: CN516
TK4: CN523
Sensor error
Reset OCR manually.( 2)
Error
Replace clogging part.
Compressor 2
Strainer
Capillary tube
TK2
Oil tank
Replace SV3E valve.
Check code name Check code name
[H16] / [d7] TK3 temperature detective circuit error
(Sub-code: 03)
(d07 / AI-NET)
YES
Is not TK3 sensor come off?
NO
YES
Is there no miscabling or misinstallation
on TK1/TK2/TK3/TK4 sensors?
NO
NO
Are characteristics of TK3 sensor
resistance value normal?
* Outdoor unit temp sensor characteristics-4
YES
After power reset,
check capillary choke of SV3C valve bypass.
Start a test operation in COOL or HEAT mode.
TK3 sensor temp is displayed on 7-segment display with SW01/02/03=[1] [13] [2].
Check TK3 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 parallel capillary is considered.
No error
Error
Check the clogging of SV3E valve.
(Note 1)
(Note 1) Refer to item [H07] error.
No error
Check I/F P.C. board
Cause of operation
1. Detachment of TK3 sensor, miscabling,
characteristics error of resistance value
2. Error of SV3C valve circuit periphery
(Check capillary clogging, strainer
clogging)
3. Refrigerant stagnation in compressor
shell
Correct installation of sensor.
Correct miscabling/misinstallation.
TK1: CN514
( )
TK2: CN515
TK3: CN516
TK4: CN523
Sensor error Replace
Error
Replace clogged part (Capillary).
Strainer
SV3E valve
TK3
Replace SV3E valve.