Daikin FTX25JVEA9 Service Manual page 298

Si18-201
Troubleshooting
Check No.1
Refer to P.300
Check No.2
Refer to P.300
Check No.6
Refer to P.303
Check No.7
Refer to P.304
Service Diagnosis
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
*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?
YES
Check if the abnormality is
re-generated when turning
the power supply off and then
back on to restart.
Is it re-generated?
YES
Check NO. 6
Power transistor check
Is it normal?
YES
Check NO. 7
Power transistor output check
Do respective
phases,U,V,W, output in
good balance?
YES
Power supply voltage check
Is it within the rating?
YES
Short-circuit
or disconnection between
coil phases of
compressor
NO
Check No. 2
Discharge pressure check
Check No. 1
Installation status check
Troubleshooting - Outdoor Unit Related
NO
NO
Do a long-term observation on
power supply voltage, discharge
/ sunction pressures, etc..
Possible causes
n
Momentary supply voltage drop
n
Excessive load on compressor
motor
n
Shorting in electric circuit due
to contact
NO
NO
NO
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.
(MF041)
285