Oil Level Detective Temperature Sensor Error; Tk1 Temperature Detective Circuit Error - Toshiba Super MMU-AP0091H Service Manual

Check code name
[H08] / [d4]
(d07 / AI-NET)
Sub-code: 01: TK1 sensor error 02: TK2 sensor error 03: TK3 sensor error 04: TK4 sensor error
The detected error is an oil level detective temperature sensor error.
Check disconnection of the wiring and resistance value of the sensor.
If the sensors are normal, replace the outdoor I/F P.C. board.
Check code name
[H16] / [d7]
(d07 / AI-NET)
Is not TK1 sensor detached?
NO
Is there no miscabling or misinstallation
on TK1/TK2/TK3/TK4 sensors?
NO
Are characteristics of TK1 sensor
resistance value normal?
YES
Start a test operation in COOL or HEAT mode.
TK1 sensor temp is displayed on 7-segment display with SW01/02/03=[1] [11] [2].
Check TK1 sensor temp approx. 10 minutes after compressor 1 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 tube, or malfunction of check valve is considered.
No error
Check the clogging of SV3E valve.
(Note 1)
No error
Check I/F P.C. board
Check code name
Oil level detective
temperature sensor error
Check code name

TK1 temperature detective circuit error

(Sub-code: 01)
YES
YES
* Characteristics-4
NO
* Outdoor unit temp sensor characteristics-4
Error
(Note 1) Refer to item [H07] error.
TK1 to TK4 sensor Open/Short
1. Coming-off of TK1 sensor, miscabling,
characteristics error of resistance value
2. Oil-equalization circuit error
(Check valve, capillary clogging,
strainer clogging)
3. Refrigerant stagnation in case of
compressor shell
Error
Replace SV3E valve.
178
Cause of operation
Circuit Connector
TK1 CN514 (Black)
TK2 CN515 (Green)
TK3 CN516 (Red)
TK4 CN523 (Yellow)
Cause of operation
Correct installation of sensor.
Correct miscabling/misinstallation.
TK1: CN514
( )
TK2: CN515
TK3: CN516
TK4: CN523
Sensor error
Replace clogged part.
Compressor 1
Strainer
Capillary tube
TK1
Oil tank