DISPLAY CABINET HEATED
14
P/N 1010772 Rev. D 12/13
TROUBLESHOOTING
WARNING
To avoid possible personal injury and/or damage to the unit, inspection, test and repair of electrical equip-
ment should be performed by qualified service personnel. The unit should be unplugged when servicing.
Problem
Possible Cause
Corrective Action
No heat, no display, and the
power switch indicator light is
OFF.
Power cord is not plugged in.
Plug the power cord into the appropriate outlet.
Circuit breaker is off or has been tripped.
Reset circuit breaker, contact your maintenance person or
Authorized Service Agency if it trips again.
No power at receptacle.
Contact your maintenance person or Authorized Service
Agency for service.
Inoperable power cord.
Inoperable power switch.
Loose, burnt, broken wiring in the circuit.
No heat, no display, and the
power switch indicator light is
ON.
Inoperable Transformer.
Contact your maintenance person or Authorized Service
agency for service.
Inoperable Control Board.
Loose, burnt, broken wiring in circuit.
Display flashes “
LO
” and the
cabinet does not heat up.
Inoperable Solid State Relay.
Contact your maintenance person or Authorized Service
Agency for service.
Inoperable Control Board.
Inoperable Heater(s).
Loose, burnt, broken wiring in circuit.
Display flashes “
HI
” and the
cabinet does not heat up.
Inoperable Thermistor.
Contact your maintenance person or Authorized Service
Agency for service.
Inoperable control Board.
Display flashes “
HI
” and the
cabinet is very hot.
Solid State Relay contacts shorted closed.
Contact your maintenance person or Authorized Service
Agency for service.
Inoperable Control Board.
Display flashes “
OPEN
” and the
cabinet does not heat up.
Thermistor is disconnected or open.
Re-secure the Thermistor onto the Control Board. If this
problem persists, contact your maintenance person or
Authorized Service Agency for service.
Inoperable Control Board.
Display flashes “
PO
” and the
cabinet does not heat up.
For 120 volt units, the supply voltage is below
100 VAC or above 135 VAC.
Contact your maintenance person or Authorized Service
Agency for service.
For 220/240 volt units, the supply voltage is
below 190 VAC or above 265 VAC.
Inoperable Control Board.
Product dries out quickly.
Setpoint temperature is set too high.
Lower the Setpoint temperature.
Incorrect wattage halogen bulb(s) being used. Use only 100 watt halogen bulb(s).
Water Tray(s) do not contain water or contain
insufficient water (for units equipped with
Water Trays only).
Add water to the Water Trays(s) and/or remove the Water
Tray Diffuser(s).
Display Cabinet glass is fogging
up and/or has condensation.
Water Tray(s) contain too much water and/or
the Water Tray Diffusers are not present (for
units equipped with Water Trays only).
Remove excess water from the Water Tray(s) and/or install
the Water Tray Diffuser(s).
Halogen Bulb(s) do not light up.
Bulb(s) burnt out.
Replace bulb(s)
Bulb(s) not seated properly into spring loaded
sockets.
Remove and reinstall bulb(s) so that the ends snap into the
socket(s).
Inoperable Resistor Assembly.
Contact your maintenance person or Authorized Service
Agency for service.
Loose, burnt, or broken wiring in Circuit.
Inoperable Bulb Sockets(s).
Front Display Graphics does not
light up.
Bulb(s) burnt out.
Replace Bulb(s).
Loose, burnt, or broken wiring in circuit.
Contact your maintenance person or Authorized Service
Agency for service.
