Troubleshooting Detail - Daikin FTX25JVEA9 Service Manual

Si18-201
3.3

Troubleshooting Detail

3.3.1 High Pressure Malfunction
E3
Outdoor Unit
Indication
Method of Continuity of the high pressure switch is detected by the safety device circuitry.
Malfunction
Detection
Malfunction When HPS malfunction is generated 4 times, the system shuts down.
Decision
(The 4-time counter resets itself when no outdoor unit abnormality occurs within 60-minute
Conditions
cumulative time after the error generation.)
"
Supposed
"
Causes
"
"
"
"
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Troubleshooting
Check No.1
Refer to P.300
Check No.2
Refer to P.300
Check No.3
Refer to P.301
Service Diagnosis
Faulty high pressure switch
Disconnection of high pressure switch's harness
Faulty connectors connection of high pressure switch
Dirty indoor unit heat exchanger
Faulty outdoor unit fan
Over-charged with refrigerant
Motorized valve clogged
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check No.1
Check the installation
conditions.
Does the outdoor
unit fan rotate?
Is HPS correctly
connected?
Turn the power supply off and
check the following after letting the
compressor rest for 10 minutes.
Does the HPS have
continuity?
YES
Check No. 2
Pressure check
Check No. 1
Installation conditions check
Cooling?
Heating
Does the warm air
come out?
It comes out.
Troubleshooting - Outdoor Unit Related
NO
YES
Check No. 3
Motorized valve EVL
check
OK
NO Check No. 3
Motorized valve EVn
check
OK
To E7 Flow Chart
Connect correctly.
Replace HPS without
continuity.
Apply required remedy
subject to the case.
Replace motorized valve if
faulty.
Replace control PC board.
Replace motorized valve if
faulty.
Replace control PC board.
(MF020)
263