Service Guide

Column Refrigeration Service Manual
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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ash
like a heartbeat
Is control board receiving power? Check control connector P1 for
Power (115V)
Check Receptacle Cabinet is plugged in Tracebacktond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