Column Refrigeration Service Manual
17
3.2 Electrical System
Table 3.2. Electrical System Diagnostics/Troubleshooting
PROBLEM
CAUSE
SOLUTION
No Power To Cabinet
Does Control board show Heartbeat?
Red LED on control board should flash
like a heartbeat
Is control board receiving power?
Check control connector P1 for
Power (115V)
Check Receptacle Cabinet is plugged in
Trace back to find where power
is interrupted
Check Power Cord
Replace if defective
Check internal cabinet wiring
Fix loose or disconnected terminals
Compressor Not Running
Ensure unit is not in Showroom Mode
Take unit out of Showroom mode
Control board compressor
LED illuminated
Green LED (LED2) should illuminate
continuously if calling for cooling
Evaporator Fans
not Running
Ensure unit is not in Showroom Mode
Take unit out of Showroom mode
Control board Evap Fan LED
illuminated
Green LED (LED7) should illuminate
when call for Evap Fans
Check power at control board
Connector P12 (Red to Black) 12VDC
Check power at fan terminal block
12VDC at block
Condenser Fans
not Running
Ensure unit is not in Showroom Mode
Take unit out of Showroom mode
Control board Cond Fan
LED illuminated
Green LED (LED4) should illuminate when
call for Cond Fans
Check power at control board
Connector P12 (Blue to Black) 12VDC
Check power at fan connectors
12VDC at connection
White Lights not Working
(Door Open)
Control Board White LED Illuminated
Green LED (LED6) should illuminate when
call for white lights
Reed switch is open
Check continuity of reed switch
(magnet on door)
Check power at control board
Connector P13 (Orange to Black) 12VDC
Loose Connection
Check connections