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Check code
[P15] / [AE]
(TCC-L / AI-NET)
Check code name
Gas leak detection
TD condition (Sub-code: 02)
Cause of operation
1. Outdoor unit service valve closed
2. Outdoor PMV error
3. TD sensor error
4. SV4 circuit error
5. Refrigerant shortage, clogging refrigerant
circuit
Coil, valve body, coil installation,
disconnection of cable, etc.
Open the service valves fully.
Repair outdoor PMV.
Replace TD1 or TD2 sensor.
Repair SV41 and SV42 circuits.
Correct cabling.
Are service valves on gas
and the liquid sides fully opened?
Are characteristics of
TD1, TD2 sensor resistance normal?
Is SV4 valve circuit normal?
(Coil misinstallation, valve leakage)
Are there indoor units connected
in different refrigerant circuit?
Refrigerant shortage,
clogging, pipe breakage.
Connectors CN300, 301 White
Refer to outdoor unit temperature
sensor characteristics-4.
(Check there is no clogging and pipe breakage and then recharge refrigerant.)
Is outdoor PMV1, 2 normal?
1. Connector connection
2. Cabling
3. Coil
4. Valve body
5. Outdoor I/F P.C. board
( )
YES
NO
YES
YES
YES
YES
NO
Replace defective parts.
Check leakage of
SV5 and SV11 circuits.
Normal
Abnormal
Correct piping.
Check for mispiping of discharge
gas/suction gas main pipes.
Normal
Normal
Abnormal
Repair the flow selector unit.
Abnormal
NO
NO
NO
Is the flow selector unit normal?
Check code
[P17] / [bb]
(TCC-L / AI-NET)
Check code name
Discharge temp TD2 error
Cause of operation
1. Outdoor unit service valve closed
2. Outdoor PMV error
3. TD sensor error
4. Refrigerant shortage, clogging of refrigerant circuit
5. 4-way valve error
6. SV4 circuit leakage, misinstallation
7. SV5 circuit leakage
8. SV6 circuit clogging
9. Mispiping of discharge gas/suction gas pipes
10. Flow selector unit error
( )
Open service valves fully.
Repair outdoor PMV.
Replace TD2 sensor.
Check 4-way valve.
Correct cabling.
Are service valves of gas and
liquid sides fully opened?
Are characteristics of
TD2 sensor resistance normal?
Refrigerant shortage, clogging, pipe breakage.
* Connectors CN300, 301 White
* Refer to outdoor unit
temperature sensor
characteristics-4.
Check there is no clogging and pipe leakage,
and then recharge with refrigerant.
Is outdoor PMV normal?
1. Connector connection
2. Cabling
3. Coil
4. Valve body
5. Outdoor I/F P.C. board
SV4 circuit
1. Are not SV41 and SV42 valve
coils installed reversely?
2. Is there no leakage through
SV42 circuit?
YES
NO
NO
YES
YES
YES
YES
NO
NO
NO
Are there indoor units connected
in different refrigerant circuit?
YES
NO
Correct piping.
YES
YES
YES
YES
Check mispiping of discharge gas/
suction gas main pipes.
Does not discharge refrigerant gas by
pass to suction sidethrough 4-way valve?
NO
Replace defective parts.
NO
Replace defective parts.
NO
Repair the flow selector unit.
NO
Correct installation of valve coil.
Replace SV42 valve.
Use the mis-wiring check
function of outdoor unit.
Check leakage of SV5 circuit.
Check clogging of SV6 circuit.
Is the flow selector unit normal?
( )