Low Pressure Error (48K Unit Only); High Pressure Error - GE UUC112WC Series Service Manual

Troubleshooting
Low Pressure Error (UUC148WC* unit only)
Low Pressure error
Lack of refrigerant?
No
Check PCB and
Low Pressure Switch
Switch Switch
Closed Open
Replace pressure
switch

High Pressure Error

High Pressure error
Excessive refrigerant?
No
Check outdoor
unit coil
Check for refrigerant
system restrictions
Switch
Check PCB and
Closed
pressure switch
Switch
Open
Start
Yes
Repair the leak &
charge refrigerant
Replace PCB
Start
Yes
Recover refrigerant
and recharge
Replace PCB
Replace pressure switch
CONNECT SERIES SERVICE MANUAL
CN17 is the low pressure switch connection. When
this connection is open, the unit will show low
pressure error. When this connection is closed, unit
will be normal, or it is PCB problem.
CN13 is high pressure switch connection. When this
connection is open, the unit will show high pressure
alarm. When this connection is closed, unit will be
normal, or it is PCB problem.
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