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Is AC mains voltage correct?
198 to 264V
After disconnection of the compressor leads from
P.C. board, the air conditioner operates in heating mode.
Does the fan motor run?
Is connection of connector
CN300 correct?
Is flow of refrigerant by
PMV under correct conditions?
Is coil of 4-way valve
electrified during heating mode?
Is there any problem on connection
of compressor lead or reactor?
(Check connection referring to the wiring diagram.)
Does 4-way valve work correctly?
(Check pipe temperature, etc.
during cooling/heating operation.)
Check temperature sensors.
TE sensor CN600, TS sensor CN603
Indoor TC sensor
Defective → Correct or replace
Correct connection of connector.
Fan motor
exchange
Check outdoor P.C. board.
Defect → Replace
Check 4-way valve.
Defect → Replace
Check PMV.
Defect → Replace
Check outdoor P.C. board.
Defective → Replace
Check outdoor P.C. board.
Defective → Replace
Replace
outdoor P.C. board.
Check compressor. (Rare short, etc.)
Defective → Replace
Correct power line.
Correct wiring.
YES
NO
YES
YES
YES
YES
NO
YES
NO
NO
NO
NO
NO
YES
YES
NO
After pulling out the connector
of the fan motor CN300, rotate its shaft by hands.
Can it rotate smoothly?
Is the fan motor coil resistance within the range described below?
Between red and white lead : 18 to 30Ω
Between white and black lead : 18 to 30Ω
Between black and red lead : 18 to 30Ω
Check
code
[P19]
APPLICATION CONTROL KIT
LED display
—
Check / Countermeasures
(Part without special mention indicates a part of the outdoor unit.)
[4-way reversal error]
[P22]
[P26]
[P29]
D01 D02 D03 D04
(Red) (Yellow) (Yellow) (Yellow)
¡¡¡
l
D01 D02 D03 D04
(Red) (Yellow) (Yellow) (Yellow)
¥
lll
D01 D02 D03 D04
(Red) (Yellow) (Yellow) (Yellow)
l
¥
ll
∗ In case of SP40 to 56, the coil of 4-way valve is electrified during cooling cycling.
∗ In cooling operation, [P19] error may be displayed when the refrigerant pressure rises high abnormally.
In this case, remove the cause of pressure rising and then diagnose it again.
[Outdoor fan system error]
[Short-circuit of compressor driving device]
[Position detection circuit error]
LED display legend:
l
Go off,
¡
Go on,
¥
Flash (5Hz)
<In case of SP40 to 56>