Troubleshooting Guide
WARMING DRAWER WWD30
5-3
ERROR CODE TROUBLESHOOTING GUIDE:
ERROR CODE CAUSE TEST / ACTION
10
(Invalid Checksum Error)
20
(Thermistor Open)
30
(Thermistor Short)
40
(Element Sensing)
50
(Door Switch)
60
(Stuck Relay)
70
(Cable Open)
Incorrect checksum
Temperature >300ºF
Temperature <-30ºF
<5º change in temperature over 10
minutes of continuous call for heat.
Occurs only during preheat mode and
the door is closed.
Door switch closed when the keypad is
being operated or unit turned on.
Drawer temperature rises to 250ºF in
any mode/state.
Cable wires that activate element or
fan relays on power board are not
making connection.
Replace Control Board
In FSM (Field Service Mode), view temper-
ature as view by thermistor. Verify wiring
ok to element. Replace Thermistor if ok.
In FSM (Field Service Mode), view temper-
ature as viewed by thermistor. Verify wiring
ok to element. Replace Thermistor if ok.
If unit outdoors and temperature below
freezing point, instruct on unit limitations.
Verify Thermal Cutout is not open.
Verify Element is not open.
Replace TCO or Element if open.
Check operation of Door Switch with Ohm
meter. Replace if defective.
Check ambient Temp and installation.
Check TCO. Replace if opened.
Replace Relay Board.
Check connection of comm cable. Use
Figure 5-1 to check voltage and/or ohm
reading of cable. If open, replace.
Figure 5-1 Communication Cable Pin Configuration
NOTE: After correcting problem, errors must first be cleared in Field Service Mode before controls will refresh error
display. To clear error codes logged, press and hold “TIMER” up and down arrow keys for 5 seconds, while in Field
Service Mode.
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