Johnson Controls YVAHP0721CW Series, Service Manual

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Alarm
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Is high pressure sensor normal?
Yes
Are expansion valves fully
closed and locked?
Check O.U. PCB and connection
of circuit board connector.
Replace electronic expansion
valves if faulty.
Check connection of circuit
board connector. Replace
high pressure sensor if faulty.
Open stop valve.
No
Is there leakage from
solenoid valves (SVA)? Replace solenoid valve (SVA)
if faulty.
No
No
Yes
Are electrical wiring and
refrigerant piping between indoor
and outdoor units incorrectly
connected?
Is outdoor unit stop valve closed?
No
No
Yes
Yes
Correctly connect it.
Check the outdoor electronic expansion valve during cooling
and the indoor electronic expansion valve during heating.
Yes
Check that indoor/outdoor intake
air temperature is not too high.
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Cause Check Item
Action
(Turn OFF Main Switch)
Event
Excessively
High Discharge
Pressure
Check stop valve. Open stop valve. Closed Stop Valve
Check outlet temp. of
solenoid valve (SVA).
Check connection.
Replace solenoid valve
(SVA) if faulty.
Leakage from Solenoid Valve
(SVA)
Check thermistor for
indoor unit and outdoor
unit inlet air temp.
Replace thermistor
if faulty.
Excessively High Indoor
Unit and Outdoor Unit
Inlet Air Temp.
Check connectors for
O.U. PCB. Replace pressure
sensor if faulty. Abnormal High Pressure
Sensor
Check electrical system
and ref. cycle.
Correctly connect them.
Incorrect Connection between
Indoor Unit and Outdoor Unit
Check connector for
O.U. PCB.
Repair connector for O.U.
PCB or expansion valve.
Replace it if faulty.
Locked Expansion Valve
(Fully Closed)
Stoppage of
Indoor Fan Check continuity of fuses.
Replace fuses. Blown Fuses
Replace I.U. PCB
and check operation. Replace I.U. PCB
if faulty.
Faulty I.U. PCB
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