York CIDM030B21E, Service Manual

Page: 63 / 144

SM-16005-rev.2
3-41
TROUBLESHOOTING
Abnormalities of Devices
Other
Abnormalities
Communication
Failure
between
I.U. and O.U.
Insufficient
Power
Supply to
Indoor Unit.
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Insufficient
Heating
Operation
Communication
Failure
Check indoor unit
indicating alarm code
“03” on wired controller.
Repair it according
to alarm code “03”.
Failure of
Indoor Unit
PCB
Check that indoor unit
capacity is 0 in
check mode of
outdoor unit PCB.
Replace indoor unit PCB.
Check wired controller
LCD or “RUN” indicator
is turned OFF.
Check indoor unit
according to
“Troubleshooting”
of this manual.
Check that damper
of EconoFresh Kit
open and closes.
Failure of EconoFresh Kit.
Replace relay wiring.
Change damper
minimum opening.