160
Heating operation
Does heating
indoor fan normally
operate?
Is indoor PMV
normal?
Is check valve
of main
discharge pipe
normal?
Is there any interference
of heat-exchanging of
indoor unit?
1. Filter clogging
2. Heat exchanger
clogging
3. Air short circuit
Is SV5 circuit normal?
Are any indoor
units in different
refrigerant circuit
connected?
Refrigerant overcharge,
clogging, pipe breakage,
abnormal overload
Is check valve
of main
discharge pipe
normal?
Is there
clogging in any
valves?
Is connector
connection, condenser
or fan motor normal?
Are
characteristics of
sensor TC2 and TCJ
resistance normal?
Check indoor P.C. board.
Faulty ➝ Replace
Repair faulty parts.
Repair check valve.
➝ Replace
Eliminate the
interference.
Replace PMV body.
Repair SV5 circuit.
Check and correct
wiring.
Replace TC2 or TCJ
sensor.
Repair faulty parts.
(Check it using the
miswiring check function
of the outdoor unit.)
(Coil error, choke,
disconnection of cables, etc.)
Are service valves fully
opened?
Are
characteristics of high-
pressure sensor
normal?
Reset power supply, and start a test operation
corresponded to the season.
Cooling operation
Does
cooling outdoor fan
normally operate?
Is there
any fan crack
or coming-off?
Is outdoor PMV normal?
1. Connector connection
2. Wiring
3. Coil
4. Valve body
5. Outdoor I/F P.C. board
Is there any
interference of heat-
exchanging of outdoor unit?
1. Heat exchanger clogging
2. Air short circuit
Is SV2 bypass
circuit normal?
Is SV4 circuit normal?
Is check valve of
main discharge pipe
normal?
Refrigerant overcharge, clogging, pipe
breakage, abnormal overload
Check code Check code name Cause
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
Cooling ➝ To (B)
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.
Open service valves fully.
Check parts.
Failure ➝ Replace
Repair faulty parts.
Repair faulty parts.
Repair outdoor PMV.
(Connector connection, fan IPDU,
fan motor, cabling)
Eliminate the interference.
Repair SV2 bypass circuit.
Repair SV4 circuit.
Repair check valve. ➝ Replace
(Coil error, clogging, disconnection
of wire, etc.)
(Coil error, clogging, disconnection
of wire, etc.)
Connectors: PMV1: CN300,
PMV2: CN301, PMV4: CN303
To Next Page
Loading...
