Service manual

Troubleshooting - Outdoor Unit Related SiE18-201
212 Service Diagnosis
3.3 Troubleshooting Detail
3.3.1 High Pressure Malfunction
Outdoor Unit
Indication
E3
Method of
Malfunction
Detection
Continuity of the high pressure switch is detected by the safety device circuitry.
Malfunction
Decision
Conditions
When HPS malfunction 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 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
Troubleshooting
Check No.1
Refer to P.249
Check No.2
Refer to P.249
Check No.3
Refer to P.250
YES
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.
Does the outdoor
unit fan rotate?
Does the warm air
come out?
(MF020)
Check No.1
Check the installation
conditions.
It comes out.
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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?
NO
Check No. 2
Pressure check
Check No. 1
Installation conditions check
YES
Cooling?
Heating
Check No. 3
Motorized valve EVL
check
OK
Check No. 3
Motorized valve EVn
check
OK