High Pressure Switch System Abnormality - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

SiBE341027

2.13 High Pressure Switch System Abnormality

H3
Remote
Controller
Display
Applicable RQYQ-PY1B
Models
Method of Error The protection device circuit checks continuity in the high pressure switch.
Detection
Error Decision When there is no continuity in the high pressure switch when the compressor stops operating.
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
Defective high pressure switch
Broken of high pressure switch harness
Defective connection of high pressure switch connector
Defective compressor
Defective outdoor unit PCB
Broken of lead wire
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Is the protection high
pressure switch connector
(X32A) correctly connected
to the outdoor unit PCB?
YES
Wait for 10 minutes after unit
stops, then check the
following.
Is there continuity at the
control and protection
high pressure switch?
YES
Is there a
disconnection or
insulation failure at the
compressor coil?
NO
Is there continuity at
the lead wire?
YES
NO
NO
YES
NO
Troubleshooting by Remote Controller
Connect it correctly.
Replace the high pressure switch
where there is no continuity.
* If normal, the resistance will be
10Ω or less.
Replace the compressor.
* If there is a compressor
malfunction, there is the
possibility that the INV. PCB and
outdoor unit PCB have been
damaged. Check that each of
these PCBs is normal.
Replace the lead wire.
Replace the outdoor unit sub PCB.
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