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