Troubleshooting

To isolate a malfunction, proceed as follows:

  • Clearly define the problem (or symptom) and when it occurs.

  • Locate the problem in the Troubleshooting table.

  • Review all possible causes. Then, one-at-a-time, work through the list of corrections until the problem is solved.

Problem Cause Solution
Product not holding temperature

 

 

 

 

    
Heat settings too low Remove front cover and adjust shelf and base heat settings

Low or improper voltage

Compare receptacle voltage to data plate voltage

Product held too long

Hold product only for recommended times
Product not placed correctly in unit Place product in unit as per operation instructions.

Product not hot when placed in unit

Place prepackaged hot food in unit
Unit not heating

Bad control board

Check set point reading; if unit for heat below setpoint and not calling for heat, control board defective. Replace control board
Faulty contactor Check contactor and replace if necessary
With power switch in POWER position, unit is completely inoperative (no power)

 

 Open circuit

Check to see that unit is plugged in.

Check breaker or fuse at supply box.

Check control panel fuses per Replacing the Fuse and Fuse Holder.

Check voltage at wall receptacle.

Check POWER switch; replace if defective.

Check cord and plug for loose connections.

Control board defective

Check for 12 volt input from transformer; replace if defective
Transformer defective Check input and output voltage; replace if defective
Shelf won't heat

 

 Shelf not plugged into receptacle properly Check that the shelf plug is firmly pushed into receptacle in the interior of the unit.
Faulty shelf heat relay Check and replace if necessary
Faulty shelf heater Check and replace if necessary

Unit not preheated

Preheat unit before loading product
Faulty PC board Replace PC board
Temperature setting “OFF” Remove front cover and increase shelf heat setting
No base heat

 

 Faulty base heat relay Check and replace if necessary

Faulty base heater

Check and replace if necessary
Unit not preheated Preheat unit before loading product
Faulty PC board Replace PC board
No light(s)

 

 Faulty contactor Check contactor and replace if necessary
Light socket shorted Replace light socket

Faulty fluorescent light bulb

Replace fluourescent light bulb
Faulty lamp ballast Replace ballast