Johnson Controls YVAHP0721CW Series, Service Manual

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Alarm
&RGH
Does inverter operate?
Yes
Does compressor operate?
Is reversing valve spindle
installed at middle position?
Are high pressure sensor and
low pressure sensor normal?
Yes
Check that indoor/outdoor intake
air temperature is not too low.
Replace high pressure sensor
or low pressure sensor if faulty.
Check compressor and
power cable.
Check inverter.
Replace reversing valve if faulty.
No
No
No
No
Is there a leak in solenoid
valve for Hot Gas Bypass (SVA)?
Yes
No
Yes
Replace solenoid valve
(SVA) if faulty.
Yes
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Cause Check Item
Action
(Turn OFF Main Switch)
Event
Excessively
Decrease
Low Compression
Ratio
Check compressor. Replace comp. if faulty. Compressor is not operating.
Check inverter. Repair faulty part. Inverter is not functioning.
Measure suction pipe
temp. of reversing valve. Replace reversing valve
if faulty. Valve Stoppage at Middle
Position of Reversing Valve
Check connector for
O.U. PCB, power source
and pressure indication.
Replace sensor if faulty.
Abnormality of High or Low
Pressure Sensor
Check indoor unit and
outdoor unit air temp.
thermistor.
Replace thermistor
if faulty. Excessively Low Indoor
Intake Air Temperature
Check Solenoid Valve.
Replace SVA if there is
leakage. Leakage from Solenoid
Valve (SVA)
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