Daikin BPMK928B42, Service Manual

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Troubleshooting - Outdoor Unit Related Si18-201
268 Service Diagnosis
3.3.6 Operation Halt Due to Discharge Pipe Temperature Control
Outdoor Unit
Indication
F3
Method of
Malfunction
Detection Discharge pipe temperature control (halt, frequency deviation, etc.) is carried out using
temperature detected by the discharge pipe thermistor.
Malfunction
Decision
Conditions
"
Case where the compressor halts operation when the temperature detected by the
discharge pipe thermistor rose to 115°C or higher. (reset when the temperature falls to 85°C
or lower.)
"
When this is generated 4 times, the system shuts down.
"
The error counter resets itself when no compressor abnormality occurs within 60-minute
cumulative time after the error generation.
(including operation halt due to other errors)
Supposed
Causes
"
Insufficient refrigerant
"
Malfunction of 4-way valve
"
Faulty discharge pipe thermistor
"
Faulty outdoor unit PC board
"
Water mixed in the piping at site
"
Faulty motorized valve
"
Faulty stop valve
"
Faulty indoor unit solenoid valve
Troubleshooting
Check No.8
Refer to P.305
Check No.3
Refer to P.301
Check No.9
Refer to P.306
Correctly place the
thermistor in the discharge
pipe.
Replace thermistor.
Replace the main unit, coil
of motor operated valve.
Refer to REMEDY for
Refrigerant system check.
Replace PC board.
Is discharge pipe
thermistor disconnected?
(MF025)
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check No. 8
Thermistor check
Faulty
NO
Check No. 3
Motorized valve check
Faulty
Check No. 9
Refrigerant system check
Faulty
OK
OK
OK
· Insufficient refrigerant
· Malfunction of 4-way valve
· Water content mixed
· Faulty stop valve