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Diagnosis/Process flowchart Item
Check
Operation
Contents
Check winding resistance
between phases of compres-
sor, and resistance between
outdoor frames by using a
tester.
• Is not grounded.
• Is not short-circuited
between windings.
• Winding is not opened.
Remove connector CN300 of
the outdoor fan motor, turn
on the power supply breaker,
and perform the operation.
(Stops though activation is
prompted.)
Check operation within 2
minutes 20 seconds after
activation stopped.
11-9. How to Check Simply the Main
Parts
11-9-1. How to Check the P.C. Board
(Indoor Unit)
(1) Operating precautions
1) When removing the front panel or the P.C.
board, be sure to shut off the power supply
breaker.
2) When removing the P.C. board, hold the edge
of the P.C. board and do not apply force to the
parts.
3) When connecting or disconnecting the
connectors on the P.C. board, hold the whole
housing. Do not pull at the lead wire.
(2) Inspection procedures
1) When a P.C. board is judged to be defective,
check for disconnection, burning, or discolora-
tion of the copper foil pattern on this P.C.
board.
2) The P.C. board consists of the following 2
parts
a. Main P.C. board part :
DC power supply circuit (5V, 12V, 15V),
Indoor fan motor control circuit, CPU and
peripheral circuits, buzzer, and Driving
circuit of louver.
b. Indication unit of infrared ray receiving
Infrared ray receiving circuit, LED :
To check defect of the P.C. board, follow
the procedure described below.
Summary
→ OK if 10MΩ or more
→ OK if 0.51Ω → 0.57Ω
(Check by a digital tester.)
NG
OK
BA
Replace control
board assembly.
Replace
control board.
Replace
compressor.
Check
compressor
winding
resistance.