141
Check code
[P20] / [22]
(TCC-L / AI-NET)
Check code name
High-pressure protective operation
Cause of operation
1. Pd sensor error
2. Service valve closed.
3. Indoor/outdoor fan error
4. Indoor/outdoor PMV clogging
5. Indoor/outdoor heat exchanger clogging
6. SV2 circuit error
7. SV4 circuit error
8. SV5 circuit error
9. Outdoor I/F P.C. board error
10. Operation error of check valve of main
discharge pipe
11. Refrigerant overcharge
Reset power supply, and start a test
operation corresponded to the season.
Open service valves fully.
Check parts.
Failure
®
Replace
*
1. Pressure by pressure gauge (Check joint)
2. Pressure display on 7-segment display
3. Output voltage of I/F P.C. board
If 1 and 2, 3 are different, an error of pressure sensor is considered.
If 2 and 3 are different, check I/F P.C. board.
Are there any obstructions to the
operation of the heat exchanger?
1. Blocked heat exchanger
2. Air short circuit
Refrigerant overcharge, clogging,
pipe breakage, abnormal overload condition
(Connector connection, fan IPDU, fan motor, wiring)
YES
YES
YES
YES
YES
NO
NO
YES
YES
YES
YES
NO
NO
Correct faulty parts.
Correct faulty parts.
(Connector connection wiring, coil mounting, valve clogging, etc)
NO
Correct faulty position.
(Coil error, clogging, disconnection of cable, etc.)
NO
Repair SV2 circuit.
(Coil error, clogging, disconnection of cable, etc.)
NO
Repair SV4 circuit.
NO
Repair check valve.
®
Replace
Eliminate the interfered causes.
NO
Cooling operation
®
To B
Heating operation
®
To C
Is SV2 circuit normal?
Is SV4 circuit normal?
Is outdoor PMV normal?
Is there no fan crack or coming-off?
B Cooling operation
Are service valves fully opened?
Does the check valve of the main
discharge pipe operate normally?
Does cooling outdoor fan normally operate?
Are characteristics of
high-pressure sensor normal?
All heating operation
Check and correct cabling.
Repair SV5 circuit.
Repair faulty parts.
Eliminate the interfered causes.
Refrigerant overcharge,
clogging, pipe breakage,
abnormal overload condition
Is connector
connection of indoor
heat exchanger fan or
fan motor normal?
Check indoor P.C. board.
Faulty
®
Replace
C
Are there
any obstructions to the
operation of the heat exchanger?
1. Air filter clogging
2. Blocked heat exchanger
3. Air short circuit
Coil error, choke,
disconnection of cable, etc.
( )
( )
Use the mis-wiring check function
of outdoor unit.
Replace TC2
or TCJ sensor.
Replace 4-way valve.
Are characteristics
of sensor TC2 and TCJ
resistance normal?
Does heating indoor fan
normally operate?
Repair faulty parts.
Replace PMV body.
Is the PMV Kit used?
Is the PMV of “PMV Kit” normal ?
Is SV5 circuit normal?
Check operation of 4-way valve.
Is indoor PMV normal?
Is connection or coil normal?
Is there clogging of the valve?
Is the connection cable
between PMV Kit and indoor unit
connected certainly?
Is the PMV built in the
indoor unit made full open?
Are there indoor units connected
to different refrigerant circuits?
PMV built in the indoor
unit is made full open.
Connection
Is check valve of main
discharge pipe normal?
Repair check valve.
→
Replac
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Normal
Abnormal