Toshiba R410A Service Manual page 150

Check code Check code name
[H16] / [d7] TK2 detective circuit system error
(Sub-code: 02)
(TCC-L / AI-NET)
YES
Has TK2 sensor become detached?
NO
YES
Is there incorrect wiring or installation
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 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. Connection of TK2 sensor.
2. Error in resistance value of TK2 sensor
(see 9-7 Sensor characteristics).
3. Oil-equalization circuit error
(check valve, capillary clogging,
strainer clogging).
4. Refrigerant stagnation in case of
compressor shell.
Correct installation of sensor.
Correct wiring/installation.
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 Check code name
[H16] / [d7] TK3 temperature detective circuit error
(Sub-code: 03)
(TCC-L / AI-NET)
YES
Has TK3 sensor become detached?
NO
YES
Is there incorrect wiring or installation
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 ambient temp.) or
temperature does not 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. Connection of TK3 sensor.
2. Error in resistance value of TK3 sensor
(see 9-7 Sensor characteristics).
3. Error of SV3C valve circuit periphery
(check capillary clogging, strainer
clogging).
4. Refrigerant stagnation in case of
compressor shell.
Correct installation of sensor.
Correct wiring/installation.
TK1: CN514
( )
TK2: CN515
TK3: CN516
TK4: CN523
®
Sensor error Replace
Error
Replace clogged part (Capillary).
Strainer
SV3E valve
TK3
Replace SV3E valve.