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Check code
[H16] / [d7]
(TCC-L / AI-NET)
Check code name
TK2 detective circuit system error
(Sub-code: 02)
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.
Has TK2 sensor become detached?
Is there incorrect wiring or installation
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 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 wiring/installation.
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
[H16] / [d7]
(TCC-L / AI-NET)
Check code name
TK3 temperature detective circuit error
(Sub-code: 03)
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.
Has TK3 sensor become detached?
Is there incorrect wiring or installation
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 ambient temp.) or
temperature does not change, a clogging of parallel capillary is considered.
(Note 1) Refer to item [H07] error.
* Outdoor unit temp sensor characteristics-4
Correct wiring/installation.
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.