– 222 –
Ye s
Ye s
[P20]
Check code CauseCheck code name
High-pressure protective
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
Are service valves fully
opened?
Is
Cooling/Heating
FS unit
normal?
Open service valves fully.
Repair Cooling/Heating
FS unit.
Reset power supply, and start a test
operation corresponded to the season.
Single Cooling → To (B)
Single heating →To (C)
* 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.
No
No
Are
characteristics of
highpressure sensor
normal?
Check parts.
Failure → Replace
NORMAL
NORMAL
NORMAL
Check
incorrect piping of discharge
gas/suction gas main
pipes.
Correct piping as normal.
ABNORMAL
ABNORMAL
ABNORMAL
PMV4, SV12
operation check
Replace defective parts.
No
No
No
No
Ye s
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Ye s
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No
Single cooling operation
(B)
No
No
Does
cooling outdoor fan
normally operate?
Is there
any fan crack
or coming-off?
Is SV2 bypass
circuit normal?
Is SV4 circuit normal?
Is check valve of
main discharge pipe
normal?
Repair faulty parts.
Repair faulty parts.
Repair outdoor PMV.
Eliminate the interference.
Repair SV2 bypass circuit.
Repair SV4 circuit.
Repair check valve. → Replace
Refrigerant overcharge, clogging, pipe
breakage, abnormal overload
(Connector connection, fan IPDU,
fan motor, cabling)
(Coil error, clogging, disconnection
of wire, etc.)
r
(Coil error, clogging, disconnection
of wire, etc.)
Is there
any interference of
heatexchanging
of outdoor unit?
1. Heat exchanger clogging
2. Air short circuit
Connectors: PMV1: CN300,
PMV2: CN301, PMV4: CN303
Is outdoor PMV normal?
1. Connector connection
2. Wiring
3. Coil
4. Valve body
5. Outdoor I/F P.C. board
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