Daikin FTX25JVEA9 Service Manual page 294

Si18-201
3.3.19 Abnormal LP Error
JC
Outdoor Unit
Indication
Method of 1. Error is determined by the LP sensor value when the compressor is off.
2. Error is determined by the LP sensor value in normal operation when the compressor is on.
Malfunction
3. Error is determined by the LP sensor value when a certain time range passed after standby
Detection
Malfunction When either of 1-3 conditions mentioned above was satisfied.
Decision
Conditions
"
Supposed
"
Causes
"
"
"
Troubleshooting
Service Diagnosis
operation at time of starting.
Defective LP sensor
Faulty connectors connection of LP sensor
Possibility of gas shortage
When cooling: Refrigerant amount 0-20%
When heating: Refrigerant amount 0-5%
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Start
Check LP sensor connectors.
Is it normal?
YES
Is the stop valve open?
NO
Is gas lacking?
NO
Does
the LP sensor value
vary in any operative
status?
YES
Faulty LP sensor
Troubleshooting - Outdoor Unit Related
NO
YES
YES
NO
Check LP sensor
connectors.
Check stop valve.
Charge with the proper
amount of refrigerant.
Could be outside causes
other than defect.
Probe where the noise
comes from and take
remedy.
Replace LP sensor after
collecting refrigerant and
charge with refrigerant.
(MF038)
281