TROUBLE-SHOOTING GUIDE SUB–123 OWNER'S MANUAL
WARNING: THE OVEN MOTOR IS THERMALLY PROTECTED AND WILL SHUT ITSELF
DOWN IF OVER-HEATED. IT MAY RESTART WITHOUT WARNING! ALWAYS TURN THE
OVEN OFF
BEFORE DOING ANY TROUBLE-SHOOTING OR SERVICE WORK ON THE
OVEN MOTOR!
IV. The Oven Door is open but the Oven Motor continues to run:
A. Check the Micro Switch [15] plunger between the Door Hinges [43]. The plunger must be free to
move in and out. Eliminate any binding by adjusting the Switch (refer to
MICRO SWITCH, How
to Replace
in the
SERVICE AND REPLACEMENT GUIDE
).
B. If the Micro Switch plunger is free to travel in and out, but the Oven Motor continues to run, the
Micro Switch itself is bad and must be replaced.
V. The Oven Blower Wheel [51] makes unusual noise:
(refer to
Fig. #9
, page 28)
A. Remove the Oven Element Cover [52]. Make sure the Oven Blower Wheel is not rubbing on the
Element Cover or the ceiling of the Oven. The position of the Blower Wheel can be adjusted by
loosening the set screws on the Blower Wheel hub and moving the Wheel up or down on the
Oven Motor shaft (refer to
BLOWER WHEEL INSTALLATION AND BALANCING
in the
SERVICE AND REPLACEMENT GUIDE
).
B. If there is no evidence of rubbing on either the ceiling of the Oven or the Element Cover, the
Blower Wheel set screws may be loose. Tighten them securely. A Blower Wheel that is only a
little bit loose can make unusual noise, and can also damage the Oven Motor.
C. Remove the Outside Top [71] and run the Oven Motor. If the Motor shows any vibration while
running, the Blower Wheel is out of balance (refer to
BLOWER WHEEL INSTALLATION AND
BALANCING
in the
SERVICE AND REPLACEMENT GUIDE
). An unbalanced Blower Wheel
may damage the Oven Motor.
VI. You have an uneven bake:
A. Make sure the Oven Element Cover [52] is fully seated against the ceiling of the Oven and
pushed all the way back until it makes tight contact with the front of the Side Walls [53].
B. Remove the Oven Element Cover [52]. Turn the Oven
ON
and set the Temperature Control [22]
to 350
°
to see if the Oven Heating Elements [6] become "red-hot". Replace any Heating
Elements that fail to become "red-hot" (refer to
OVEN HEATING ELEMENTS, How to Replace
in the
SERVICE AND REPLACEMENT GUIDE
).
NOTE:
The Oven Heating Elements will not function until the Oven Door is closed or the Micro
Switch [15] is depressed by hand.
C. Make sure the Oven Door Gasket [46] is intact and seals completely around the Oven Door (refer
to
Fig. #21
on page 43 and
DOOR LATCH, How to Adjust
in the
SERVICE AND
REPLACEMENT GUIDE
).
D. Make sure the Oven Side Walls [53] and Oven Element Cover [52] are correctly installed in the
Oven. The ½" flange on the back of the Element Cover and each Side Wall must
be inserted into
the guide braces welded to the sides and ceiling of the Oven. Make sure all mounting
thumbscrews are present and tight.
E. If all of the above steps have been checked and okayed, and you still have an uneven bake, we
ask that you please call our NU–VU
®
Service Department at (800) 338-9886. Be prepared to
describe exactly what is wrong with your bake so that we may be of assistance.
NU-VU
®
FOOD SERVICE SYSTEMS MENOMINEE, MICHIGAN 49858-0035
page
22
Sales Fax (906) 863-5889 ♦ Service Fax (906) 863-6322 (800) 338-9886
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