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

 

 

 

 

    

Control temperature set too low

Increase air temperature (SP-3) in Special Program Mode
Doors left open Keep doors closed except to load and unload product

Door gasket damaged or worn

Replace bad door gaskets

Bad air heater

Check heaters and replace if bad See Tech Mode items 10 and 16
Blower not working Check blower and replace if bad See Tech Mode item 18

Bad air heater, or blower relays

Replace relay See Tech Mode items 10 and 16
Bad high limit Check high limit and replace if bad

Low or improper voltage

Compare receptacle voltage to data plate voltage
Air probe faulty, open (“E-6A”), or shorted (“E-6B”) Check probe resistance and replace, if necessary

Product held too long

Hold product only for recommended times
Cabinet steaming product soggy Humidity setpoint too high Decrease humidity setpoint (SP-4) in Special Program Mode
Water heater probe faulty, open (“E-12A”), or closed (“E-12B”) Check probe resistance and replace, if necessary

Bad humidity sensor (“E-17”)

Replace humidity sensor

Relay stuck closed Replace relay

Vent stuck closed (“E-80”)

  • Bad vent motor - replace

  • Check alignment and condition of mechanical vent parts

  • Vent acorn nuts too tight, loosen, if necessary
Product dry

 

Humidity set too low

 Increase humidity setpoint (SP-4) in Special Program Mode

No water in pan

Check water shut-off valve
Bad float switch Replace float switch

Bad water heater high limit

Replace high limit
Bad water heater Check heater and replace if bad; see Tech Mode item 18

Vent stuck open ("E-80")

  • Bad vent motor - replace

  • Check alignment and condition of mechanical vent parts
Unit not reaching set temperature

 

 

Doors left open

Keep doors closed except to load and serve product

Door gasket damaged or worn

Replace bad door gaskets
Thermometer not indicating true temperature Check cabinet temperature with another thermometer; have thermometer replaced if necessary
Blower not working Check Blower and replace if bad
Blower not working Check Blower and replace if bad; see Tech Mode item 18

Bad air heater

Check heaters and replace if bad; see Tech Mode item 18
Bad air heater, or blower relays Replace relay

Unit not heating

 

 

 

 

Bad high limit

Check high limit; replace if bad

Bad control board

Replace control board

Bad air heater or blower relays

Replace relay

Bad air heater

Check heaters and replace if bad; see Tech Mode item 18

Faulty wiring

Check for loose connections or broken wires
Blown fuse Change 15 amp fuse.
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

Blower not working

Check blower and replace if bad; see Tech Mode item 18
Relay stuck closed Replace relay

Water does not drain

Drain clogged

Remove drain obstruction