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SERVICE 500 SERIES RESTAURANT RANGES
PAGE 22 OF 44 OWNER’S MANUAL 1188716 (02/07)
TROUBLESHOOTING CONVECTION-OVEN BLOWER
WARNING
Before attempting to service or replace any electrical component, make sure power source has been
disconnected.
CAUTION
When changing motor or servicing range, always verify that blower wheel rotation is clockwise when looking into
the oven cavity.
The motor is serviceable from the front of the range through the oven cavity. Remove the back lining. Disconnect the
motor mount plate by removing the eight hex nuts that secure it to the oven interior back. Pull the mount plate, with
motor attached, into the oven.
Motor lubrication information can be found on permanent label located on motor.
If the blower does not run at all, consult the flowchart that begins on the next page. If the blower runs intermittently,
consult the flowchart on this page.
The appropriate wiring diagram for the oven can be found on the rear of the oven (as well as at the end of this section
of this manual).
Figure 10
Convection-Oven Blower Runs Intermittently
DISCONNECT POWER AT CIRCUIT BREAKER.
Convection-oven blower runs intermittently.
Check that there are no air-flow obstructions around the range.
Does the problem
occur only when the oven
is hot?
No Yes
Check that the blower motor air vents are not obstructed.
Check that the blower motor is not pressing against the wall
behind the range.
Check for excessive grease and dust buildup on the motor.
Check for sources of excessive heat behind the range.
Check for hot-air leaks around the motor pocket.
Check all wiring for loose connections or breaks.
With the blower turned ON, turn the oven thermostat to OFF and
allow the oven to cool. If the blower motor runs continuously
when the oven is cool, turn the oven thermostat to the highest
setting. If the blower motor shuts off when the oven becomes hot,
and if there are no sources of excessive heat around the blower
motor, re
p
lace the blower motor.
Remove the cover from the junction box on the back of the range.
Disconnect the black wire and place an ammeter in the circuit.
CAUTION: Check that the ammeter is rated for at least 40
amperes! Reconnect the power to the range and turn on the
blower switch while watching the ammeter. The reading should
surge and then return to the rated current of the motor when
running at high speed. If the measured current exceeds the motor
rating, replace the blower motor.