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
	Bad air heater	Check heaters and replace if bad
	Blower not working	Check blower and replace if bad
	Doors/drawers left open	Keep doors/drawers closed except to load and serve product
	Product held too long	Hold product only for recommended times
	Control temperature set too low	Increase air temperature (CDT control only) or Increase thermostat setting by removing hole plug on control panel and turning the shaft clockwise with a screwdriver
Unit not reaching set temperature	Doors left open	Keep doors closed except to load and serve product
	Faulty thermostat	Check thermostat and replace if needed
	Blower not working	Check Blower and replace if bad
Unit not heating	Bad air heater	Check heaters and replace if bad
	Faulty wiring	Check for loose connections or broken wires
	Faulty solid-state relay (CDT units only)	Replace solid-state relay
	Faulty control board (CDT units only)	Replace control board
	Faulty thermostat	Check thermostat and replace if needed
With switch in ON position the cabinet is completely inoperative	Unit not connected to electrical supply	Plug cord into electrical outlet
	Open breaker or fuse	Reset breaker or install new fuse in junction box
	Faulty cord or plug	Check cord and plug
	Faulty power switch	Check power switch
Unit overheating	Faulty thermostat	Check thermostat; replace thermostat
	Faulty blower	Check blowers; replace blower
	Faulty control board (CDT units only)	Replace control board.
With power switch turned on, the blower and fan operate, but the power light is off and the unit won’t heat	Open high limit	With unit cool, check high limit If the high limit opened because of overheating, refer to Unit Overheats section of Troubleshooting Guide