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Check code
[P04] / [21]
(TCC-L / AI-NET)
Check code name
Actuation of
high-pressure SW
Cause of operation
1. High-pressure SW error
2. Service valve closed
3. Pd sensor error
4. Indoor/outdoor fan error
5. Indoor/outdoor PMV choke
6. Indoor/outdoor heat exchanger clogging, air short circuit
7. SV2 circuit error
8. SV4 circuit error
9. SV5 circuit error
10. Discharge line check valve malfunction
11. Refrigerant overcharge
Sub-code: 01: Compressor 1 side 02: Compressor 2 side Note) High-pressure SW is normally closed.
(B contact)
Check I/F P.C. board.
Failure Replace
( )
Coil error, clogging,
disconnection of wiring, etc.
Connector connection,
fan IPDU, fan motor, wiring
Check and correct cabling.
Open service valve fully.
Replace defective parts.
Repair the flow selector unit.
Replace the high-pressure sensor.
Repair faulty parts.
Eliminate the interfered causes.
Repair SV2 circuit.
Correct piping.
Check parts.
Failure Replace
A
All cooling operation To B
All heating operation To C
Reset power supply, and start a test
operation corresponding to the season.
Is SV2 circuit normal?
B All cooling operation
Does cooling outdoor fan normally operate?
Check operation of PMV3 SV12 valve.
Is the flow selector normal?
Is circuit cabling normal?
Is service valve fully opened?
Does high-pressure SW operate?
Are parts of high-pressure SW normal?
Check for mispiping of
discharge/suction gas main pipes.
Is there no crack or
coming-off of fan?
Are characteristics of
high-pressure sensor normal?
NO
NO
NO
YES YES
NONO
YES
NO
NO
Abnormal
Abnormal
Abnormal
YES
YES
Normal
YES
Normal
Normal
YES
NO
YES
Are there any obstructions in the operation of the indoor heat exchanger?
1. Air filter clogging
2. Heat exchanger clogging
3. Air short circuit
( )
Refrigerant overcharge, clogging,
pipe breakage, abnormal overload condition
All heating operation
Check indoor P.C. board.
Failure Replace
Repair
faulty parts.
Replace TC2
or TCJ sensor.
Replace PMV body.
Is SV4 circuit normal?
Is SV11 circuit normal?
Are connector connection,
heat exchanger, fan, and
fan motor normal?
Are characteristics of TC2
and TCJ sensor resistance
value normal?
Is connector
connection,
coil normal?
Repair SV4 circuit.
Coil error, clogging,
disconnection of wiring, etc.
Are indoor units of different
refrigerant circuit connected?
Is there clogging
of
the
valve?
Is indoor
PMV normal?
Does heating indoor fan
normally operate?
Repair
faulty parts.
A C All heating operation
Repair faulty position.
Refrigerant overcharge,
clogging,pipe breakage,
abnormal overload condition
Check and
correct the cabling.
Check with miscabling check
function of outdoor unit.
Eliminate the
interfered causes.
Are there any
obstructions in the operation
of the indoor heat exchanger?
1 Air filter clogging
2 Heat exchanger clogging
3 Air short circuit
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
Is 4-way valve normal?
Replace 4-way valve.
NO
NO
YES
NO
NO
NO
NO
( )
Check code
[P05] / [AF]
(TCC-L / AI-NET)
Check code name
Open phase, negative phase
Cause of operation
1. Power supply open phase
2. Power supply negative phase
• Check the phase power line of outdoor unit.
• Check error of outdoor I/F P.C. board.
• Check there is no looseness, etc of terminal.