Johnson Controls HICM008B21S - Insufficient Cooling Operation Causes; Communication and Power Supply Failures

3-38
SM-18003
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
Cooling
Operation
Communication
Failure
Check indoor unit
indicating alarm code
“03” on wired controller.
Repair it according
to alarm code “03”.
Check wired controller
LCD or “RUN” indicator
is turned OFF.
Check indoor unit
according to
“Troubleshooting”
of this manual.
Failure of
Indoor Unit
PCB
Check that indoor unit
capacity is 0 in
check mode of
outdoor unit PCB.
Replace indoor unit PCB.
Check that damper
of EconoFresh Kit
opens and closes.
Failure of EconoFresh Kit.
Replace relay wiring.
Change damper
minimum opening.