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Test Procedures
!
WARNING
Thermal Fan Switch
The thermal fan switches are mounted on the rear in-
sulation retainers behind the oven cabinet back pan-
els. The fan switches monitor the temperature at the
rear of the oven cabinet and supply power to the fan
motors if the rear cabinet temperatures exceed 150
degrees F.
The thermal fan switch contains three terminals. Ter-
minal 1 is the common terminal connected to the
power source. Terminal 2 is the N.O. terminal con-
nected to the fan motors and terminal 3 is the N.C. ter-
minal connected to the selector switch terminal 3.
During most cooking operations, the C-NC contacts
remain closed. When the oven rear cabinet tempera-
tures reach approximately 150 degrees F, contacts C-
NC open and C-NO close supplying power to the fan
motors.
Use the following procedure to check contacts C-NC
for continuity.
1. Disconnect power to oven. Remove switch wiring.
2. Access thermal fan switches by removing the oven
from the cabinet and rear cabinet back panels.
3. Set ohmmeter to the low ohms range.
4. Attach meter leads to switch terminal 1 or COM
and 3 or NC.
5. Meter should indicate low ohms or continuity. It is
difficult to check fan switch contacts COM-NO
since they are closed when the rear oven cabinet
temperature reaches 150 degrees F and above.
Thermal Fan Switch
RA233001 Rev. 3
To avoid the risk of electric shock, personal injury or death, disconnect power
To avoid the risk of electric shock, personal injury or death, disconnect power
To avoid the risk of electric shock, personal injury or death, disconnect power
To avoid the risk of electric shock, personal injury or death, disconnect power
To avoid the risk of electric shock, personal injury or death, disconnect power
before servicing, unless testing requires it.
before servicing, unless testing requires it.
before servicing, unless testing requires it.
before servicing, unless testing requires it.
before servicing, unless testing requires it.
22
Fan Motors
The fan motors are mounted to the control compart-
ment back. They cool the exterior oven cabinets, elec-
trical components and close the sail switch contacts
during self-clean operation. Use the following proce-
dure to check for continuity.
1. Disconnect power from oven. Remove motor wir-
ing.
2. Remove oven from cabinet. Remove cabinet back.
3. Set ohmmeter to the low ohm range.
4. Attach meter leads to wiring terminals. Meter
should indicate a low resistance reading of ap-
proximately 20-30 ohms for continuity.
5. If an open circuit is indicated, the motor coil is de-
fective. Replace motor.
Electronic Clock Timer
The electronic clock timer controls the amount of time
the oven is on during timed bake and self-clean opera-
tions. Clock timer terminals 1 and 2 are connected to
the 120 VAC power supply with terminal 1 connected
to the "hot" side and terminal 2 connected to the white
or neutral side of the line. The clock also contains two
sets of relay operated switch contacts (11-12 and 13-
14) that are used in timed bake, broil and self-clean
operations.
During a time bake operation, clock contacts 11-12
close supplying power to the bake circuit through the
selector switch, thermostat, bake ignitor and bake gas
valve to neutral. When the preset amount of time
counts down to zero, contacts 11-12 open, removing
power to the bake circuit and turning the oven off.
During the self-clean operation, clock contacts 11-12
and 13-14 close supplying power to the fan motors and
self-clean relays. When the clean time counts down to
zero, clock contacts 11-12 open, removing power to
the fan motors and 13-14 open, removing power to the
clean relays and turning the oven off. The fan motors
may continue to run after these contacts open due to
the thermal fan switches supplying power to the fan
motors at higher oven cabinet temperatures.
The clock timer can be tested in the oven with power
applied or with the timer removed for a bench test.
Both tests require the timer display to be operational.
If the timer is removed for a bench test, a line test cord
should be connected to terminals 1 and 2 to provide
120 VAC for clock operation.
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