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No
No
No
No
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
No
All 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
No
No
No
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
No
No
ABNORMAL
ABNORMAL
NORMAL
NORMAL
No
No
(C)
No
No
All heating operation
Does heating
indoor fan normally
operate?
Is indoor PMV
normal?
Is check valve
of main
discharge pipe
normal?
Is SV5 circuit normal?
Are any indoor
units in different
refrigerant circuit
connected?
Are
characteristics of
sensor TC2 and TCJ
resistance
normal?
Is connector
connection and coil
normal?
Is connector
connection, condenser
or fan motor normal?
Repair faulty parts.
Repair faulty parts.
Repair check valve.
→ Replace
Repair SV5 circuit.
Check and correct
wiring.
Replace TC2 or TCJ
sensor.
Refrigerant overcharge,
clogging, pipe breakage,
abnormal overload
Check indoor P.C. board.
Faulty → Replace
(Coil error, choke,
disconnection of cables, etc.)
r
(Check it using the
miswiring check function
of the outdoor unit.)
Eliminate the
interference.
Is there any interference
of heat-exchanging of
indoor unit?
1. Filter clogging
2. Heat exchanger
clogging
3. Air short circuit
No
Is there
clogging in any
valves?
Replace PMV body.
4-way
valve operation
check
Replace 4-way valve.
SV11
circuit clogging
check
Replace defective parts.
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