Daikin FTX25JVEA9, Service Manual

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Troubleshooting - Outdoor Unit Related Si18-201
288 Service Diagnosis
3.3.25 Stall Prevention
Outdoor Unit
Indication
L9
Method of
Malfunction
Detection Stall prevention system error is detected using the compressor's output current.
Malfunction
Decision
Conditions
#
When the compressor's output current of 33A or higher continued for 0.3 seconds and peak
current reached to 65A or higher
#
When the compressor's output current of 33A or higher continued for 5 seconds
#
When failing to changeover the position detecting function
"
When a stall prevention error is generated 4 times, the system shuts down.
(The 4-time counter resets itself when no outdoor unit abnormality occurs within 60-minute
cumulative time after the error generation.)
Supposed
Causes
"
Faulty compressor
"
Overcurrent due to faulty PC board
"
Incorrect detection due to faulty PC board
"
Overload due to incorrect installation
"
Overload at time of starting including high differential pressure start, etc.
Troubleshooting
Check No.5
Refer to P.302
Check No.6
Refer to P.303
Check No.7
Refer to P.304
Check No.1
Refer to P.300
Check No.2
Refer to P.300
YES
Faulty pressure balance
Apply required remedy
subject to the case.
Replace compressor.
Apply required remedy
subject to the case.
Apply required remedy
subject to the case.
Is the
differential pressure
between higher and lower
pressure prior to starting
2kgf/cm²?
(MF044)
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check No. 5
Main circuit wiring
connection check
Check No. 6
Power transistor check
Check No. 7
Power transistor output check
Check No. 1
Installation conditions check
OK
Check No. 2
Discharge pressure check
OK
Is the
compressor short-circuited or
ungrounded?
YES
NO