6
68 Inch Digital Conveyor Pizza Ovens Operator’s Manual – Model MGD
TROUBLESHOOTING
Problem
Might be Caused By
Course of Action
Oven will not turn on when the power
button on the front of the oven is
pressed.
Master On/Off switch on the back of the
oven is in the OFF position.
Position the switch to the ON position.
Oven is plugged into incorrect voltage.
Check voltage at the wall outlet. Plug oven into correct voltage.
Display on control panel is blank, oven is
plugged in and turned on.
Control panel circuit breaker, located on
the back of the oven, may have tripped.
Check for a broken heating element. Replace the element. After the
issue has been resolved, press the button on the circuit breaker to
reset it.
Display shows an zone alarm:
prb1,
prb2, prb3, prb4
and the control
panel emits a continuous beep.
Temperature probe in the zone indicated
by the alarm code is not responding.
Press any key to turn off the alarm. Contact Vollrath Technical
Services.
Display will not change from
Warming
to
Redy
.
One heat zone may not be on.
Examine heating elements in each heat zone to verify they are
working.
Oven is plugged into incorrect voltage.
Check voltage at the wall outlet. Plug oven into correct voltage.
Display changes from
Warming
to
Heating
and does not display
Redy
.
Temperature setting in one or more
zones may be too high.
Maximum temperature for each zone is 550
°
F. Adjust the
temperatures to below the maximum.
Conveyor will not reverse direction.
The conveyor may be obstructed.
Check for and clear obstructions in the conveyor.
The speed button was not been pressed
correctly.
Press and hold the speed button until you hear two beeps.
There may be a problem with the drive
system relay.
Contact Vollrath Technical Services.
Conveyor speed will not change.
Set button was not pressed after setting
the new speed.
Press the Set button after changing the speed. See “Change the
Conveyor Speed” on page 4.
There may be a problem with the driver
board.
Contact Vollrath Technical Services.
Conveyor will not turn, but the oven
heats.
The conveyor may be obstructed.
Check for and clear obstructions in the conveyor.
There may be a problem with one of the
components.
Contact Vollrath Technical Services.
Conveyor circuit breaker, located on the
back of the oven, may have tripped.
Press the button on the circuit breaker to reset it.
Top or bottom heater tubes do not heat. One or more heating elements may have
burned out in the zone indicated by the
alarm code shown on the display.
Press any key to turn off the alarm. Contact Vollrath Technical
Services.
Oven repeatedly overheats.
The crumb tray may not be installed.
Verify the crumb tray is installed.
The fan may be dirty.
Verify the fan blades of both fans are clean. See the instructions
below for inspecting and cleaning the fan blades.
The fan blades may be dirty.
Inspect the fan blades of both to see if they are dirty.
1. Press and hold the power button on the front of the oven until
the display shows OFF. Unplug the oven.
2. Wait 30 minutes for the oven cool.
3. Clean the fan blades.
4. Plug in the oven.
5. Press the power button on the front of the oven.
6. Press the reset button.
7. If the problem persists call Vollrath Technical Services.
There may be a problem with the fan.
Run the oven for 10 minutes. If the fan does not run, contact
Vollrath Technical Services.
The fan is not running.
There may be a problem with the fan or
fan switch.
Run the oven for 10 minutes. If the fan does not run, contact
Vollrath Technical Services.
The oven is turned off and the fan is
running.
Normal operation. The fan turns on as
needed to cool the oven.
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