Daikin FTX25JVEA9 Service Manual page 283

Troubleshooting - Outdoor Unit Related
3.3.8 Malfunction of High Pressure Switch System
H3
Outdoor Unit
Indication
Method of Continuity of high pressure switch is detected by the safety device circuitry.
Malfunction
Detection
Malfunction When the compressor is off, and the high pressure switch doesn't have continuity.
Decision
Conditions
"
Supposed
"
Causes
"
Troubleshooting
270
Faulty high pressure switch
Disconnection of high pressure switch harness
Faulty connectors connection of high pressure switch
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Are HPS
connectors for control
and safety correctly connected
to outdoor unit PC
board?
YES
Check the following after
letting rest for 10 minutes.
Do the HPS's
for control and safety have
continuity?
YES
NO
NO
Si18-201
Correct the connection.
Replace HPS without
continuity.
*Normal resistance is 10Ω
or less.
Replace outdoor unit PC
board.
(MF027)
Service Diagnosis