Johnson Controls YVAHP072B31S, Service Manual

Page: 1416 / 1796

Service Manual
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Is there leak from
solenoid valve (SVA)?
Is low pressure sensor normal?
Check that indoor/outdoor intake
air temperature is not too high.
No
No
Yes
Yes
Is reversing valve spindle
installed at middle position?
Replace low pressure sensor
if faulty.
Replace solenoid valve (SVA)
if faulty.
Replace reversing valve if faulty.
No
Yes
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Excessively
Increase
Low Suction
Pressure
Check outlet pipe temp.
of solenoid valve (SVA).
Check connecting wires.
Replace solenoid valve
(SVA) if faulty.
Leakage from Solenoid
Valve (SVA)
Measure suction gas
pipe temp. of reversing
valve.
Replace reversing valve
if faulty. Valve Stoppage at Middle
Position of Reversing Valve
Check connectors
of O.U. PCB and
power source.
Replace sensor if faulty.
Abnormal Suction
Pressure Sensor
Check indoor unit and
outdoor unit suction
air temp. thermistor.
Replace thermistor
if faulty.
Excessively High Indoor
Unit and Outdoor Unit
Suction Air Temperature
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