Daikin FTX25JVEA9 Service Manual page 301

Troubleshooting - Outdoor Unit Related
3.3.25 Stall Prevention
L9
Outdoor Unit
Indication
Method of Stall prevention system error is detected using the compressor's output current.
Malfunction
Detection
#
Malfunction
Decision
#
Conditions
#
"
"
Supposed
"
Causes
"
"
"
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
288
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.)
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.
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Is the
differential pressure
between higher and lower
pressure prior to starting
2kgf/cm²?
YES
Check No. 5
Main circuit wiring
connection check
Check No. 6
Power transistor check
Check No. 7
Power transistor output check
OK
Is the
compressor short-circuited or
ungrounded?
NO
Check No. 1
Installation conditions check
OK
Check No. 2
Discharge pressure check
NO
YES
Si18-201
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.
(MF044)
Service Diagnosis