Johnson Controls YVAHP072B31S, Service Manual

Page: 1446 / 1796

3-132
Service Manual
TROUBLESHOOTING
Abnormalities of Devices
Other
Abnormalities
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Cooling or
Heating
Operation
with
Abnormal
Sound
Outdoor Fan
does Not Operate
even when
Compressor
is Operating
Is there any abnormal
sound from Inside of
compressor?
Replace compressor.
Wear or
Breakage of
Internal
Comp. Parts
Check expansion valve
opening.
Check each part is
tightly fixed.
Abnormal
Sound from
Compressor
Failure of
Installation
Tightly fix it.
Ensure superheat.
Liquid Ref.
Compression
Check resistance of
crankcase heater or fuse. Replace crankcase
heater or fuse.
Crankcase
Heater does
Not Get Warm
Check it by viewing.
Remove foreign
particles. Foreign Particles Inside
Fan Casing
Check it by viewing.
Adjust position of
fan wheel. Indoor Unit Fan Wheel
Contacts Casing
Check it by viewing.
Adjust position of
propeller fan.
Outdoor Unit Propeller Fan
Comes in Contact with Fan Shroud
Check surface of
contacts. Replace magnetic
switch. Humming Sound from
Magnetic Contactor
Check each fixing
screws.
Tightly fix it.
Abnormal Vibration of
Cabinets
Check obstacles. Remove obstacles. Obstacle at Outdoor Fan
Check wiring.
Correctly connect wires.
Disconnected Wire for
Indoor Fan
Check AC chopper. Replace AC chopper. Failure of AC chopper
Wait for switching of
reversing Valve.
(1 to 3 minutes)
If the reversing valve is
not switched, check for
insufficient refrigerant.
Preparatory State for
Heating Operation
Indoor Fan
does Not Operate
even when
Compressor
is Operating
Check operation
pressure.
Add refrigerant.
Discharge pressure does
not increase higher than
2.2MPa due to insufficient
refrigerant.
Check each part is
tightly secured.
Check each
tightening screws.
Discharge pressure does
not increase higher than
319 psi (2.2MPa) due to
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Is there any abnormal
sound from inside of
compressor?
Tightly secure it.
Tightly secure it.