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Warming Drawer WWD30-2
Warming Drawer WWD30-2
ERROR CODE TROUBLESHOOTING GUIDE:
ERROR CODE
10
(Invalid Checksum Error)
20
(Thermistor Open)
30
(Thermistor Short)
40
(Element Sensing)
50
(Cooling Fan Switch)
60
(Stuck Relay)
70
(Cable Open)
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.
CAUSE
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.
Cooling Fan 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.
P1 - Blue / 17VAC
P2 - Orange / 17VAC
P3 - White / Cable Gnd
P4 - Green / Relay Supply Voltage
P5 - Red / Fan Relay Actuation
P6 - Black / Heater Relay Actuation
Figure 5-1 Communication Cable Pin
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.
Replace TCO or Element if open.
Check operation of Cooling Fan Switch
with Ohm meter. Replace if defective.
Check ambient Temp and installation.
Check TCO. Replace if opened.
Check connection of comm cable. Use
Figure 5-1 to check voltage and/or ohm
reading of cable. If open, replace.
Configuration
5-3
#814750 - Revision A.1 - February, 2020
Troubleshooting Guides
TEST / ACTION
Replace Control Board
Verify Element is not open.
Replace Relay Board.
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