Service manual

Troubleshooting - Outdoor Unit Related SiE18-201
234 Service Diagnosis
Troubleshooting
Check No.1
Refer to P.249
Check No.2
Refer to P.249
Check No.6
Refer to P.252
Check No.7
Refer to P.253
Check if the abnormality is
re-generated when turning
the power supply off and then
back on to restart.
YES
Fully open stop valve.
Can be used as is.
(∗Monitering may be required)
Check connectors of
electric components.
Replace outdoor unit PC
board.
Replace outdoor unit PC
board.
Correct power supply.
Replace compressor.
Is it re-generated?
Is it within the rating?
(MF041)
NO
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check NO. 6
Power transistor check
Is it normal?
NO
Power supply voltage check
YES
*Output overcurrent will be generated due to incorrect connection of internal wiring.
When the operation is halted due to output overcurrent after connecting/disconnecting
the wiring for replacement of parts, etc., check the wiring again.
Is the stop valve
fully opened?
NO
YES
Do a long-term observation on
power supply voltage, discharge
/ sunction pressures, etc..
Possible causes
Momentary supply voltage drop
Excessive load on compressor
motor
Shorting in electric circuit due
to contact
Check NO. 7
Power transistor output check
Do respective
phases,U,V,W, output in
good balance?
NO
YES
YES
Short-circuit
or disconnection between
coil phases of
compressor
YES
NO
Check No. 2
Discharge pressure check
Check No. 1
Installation status check