P4" Outdoor Unit: Malfunction Of Inverter Radiating Fin Temperature Rise Sensor - Daikin CMSQ200A7W1B Service Manual

SiBE28-805
P4
3.36 " " Outdoor Unit: Malfunction of Inverter Radiating Fin
Temperature Rise Sensor
P4
Remote
Controller
Display
Applicable CMSQ200A7, 250A7
Models
Method of Resistance of radiation fin thermistor is detected when the compressor is not operating.
Malfunction
Detection
Malfunction When the resistance value of thermistor becomes a value equivalent to open or short circuited
status.
Decision
★
Conditions
Supposed
Causes
Troubleshooting
Power OFF
Power ON
Troubleshooting
Malfunction is not decided while the unit operation is continued.
"P4" will be displayed by pressing the inspection button.
Defect of radiator fin temperature sensor
Defect of inverter PC board
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Disconnect the cable from the
compressor, and then check
the compressor for the
insulation resistance.
The insulation
resistance is low (i.e., not more than
100kΩ.)
Disconnect the cable from the
fan, and then check the fan
motor for the insulation
resistance.
The insulation
resistance is low (i.e., not more than
1MΩ.)
Remove and insert the fin
thermistor connector [X111A].
Turn ON the
power supply, and then check
whether or not the malfunction
recurs.
Troubleshooting by Indication on the Remote Controller
YES
NO
YES
NO
YES
NO
Replace the
compressor.
Replace the fan motor
Replace the fan driver
PC board.
Replace the inverter
PC board.
End
187