Johnson Controls YVAHP072B31S, Service Manual

Page: 1423 / 1796

Service Manual
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Alarm
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Yes
Yes
Faulty
Turn OFF power, disconnect
U, V, W from compressor
terminals and restart operation.
Is protecting function
activated? *3)
Check transistor module.
*1) *2)
Normal
No
Is heat exchanger of
outdoor unit clogged?
Replace inverter PCB. *1)
Remove clogging or
replace heat exchanger.
Replace transistor module.
*1) *2)
Yes
Yes
Is silicon grease applied all over
contact surface of transistor module
and radiation fin? Is screw on
transistor module loose?
No
No
No
Apply silicon grease over
entire contact surface of
transistor module and
radiation fin.*4)
Fix screw correctly.*4)
Check inverter PCB. *1)
Check compressor.
Normal
Normal
Replace inverter PCB and
transistor module. *1) *2)
Failure of inverter PCB.
Replace it. *1)
Connect power line to
Current Transformer (CT2).
Yes
(It trips immediately.)
No (It trips after a certain period.)
To Next Page
Restart operation.
Does it trip soon?
Is power line connected
to Current Transformer (CT2)?
Abnormal
Abnormal
(Itc=1, 12)
(Itc=21)
Replace compressor.
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