Toshiba MMU-AP0121MH - Manual (Page 77)

77
Check code name
[H16]
Check code name
Oil level detective circuit system error
(Auxiliary code : 02)
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
Is not TK2 sensor detached?
Is there no miscabling or misinstallation
on TK1/TK2/TK3/TK4 sensors?
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.
1 Refer to item [H07] error.
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.
Outdoor unit temp sensor characteristics-4
Correct miscabling/misinstallation.
TK1: CN514
TK2: CN515
TK3: CN516
TK4: CN523 ( )
YES
YES
YES
NO
NO
NO
Check I/F P.C. board
Correct installation of sensor.
Check the clogging of SV3E valve.
(*1)
Are characteristics of TK2 sensor
resistance value normal?
No error
Error
Error
No error
Does OCR of MG-SW operate?
YES
NO
Reset OCR manually.( 2)
Sensor error
Replace clogging part.
Replace SV3E valve.
Strainer
Compressor 2
Oil tank
Capillary tube
TK2
After power reset
Check code name
[H16]
Check code name
TK3 temperature detective circuit error
(Auxiliary code : 03)
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
Is not TK3 sensor come off?
Is there no miscabling or misinstallation
on TK1/TK2/TK3/TK4 sensors?
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.
(Note 1) Refer to item [H07] error.
* Outdoor unit temp sensor characteristics-4
Correct miscabling/misinstallation.
TK1: CN514
TK2: CN515
TK3: CN516
TK4: CN523 ( )
YES
YES
YES
NO
NO
NO
Check I/F P.C. board
Correct installation of sensor.
Are characteristics of TK3 sensor
resistance value normal?
Check the clogging of SV3E valve.
(Note 1)
No error
Error
Error
No error
Sensor error Replace
Replace clogged part (Capillary).
Replace SV3E valve.
SV3E valve
Strainer
TK3
After power reset,
check capillary choke of SV3C valve bypass.