FULL SIZE ELECTRIC CONVECTION OVENS - TROUBLESHOOTING
F25105 (Rev. A, October 2007) Page 56 of 60
TROUBLESHOOTING
Certain procedures in this section require electrical test or measurements while power is
applied to the machine. Exercise extreme caution at all times. If test points are not easily accessible,
disconnect power and follow lockout / tagout procedures, attach test equipment and reapply power to
test.
ALL MODELS
SYMPTOMS POSSIBLE CAUSES
Blower motor doesn’t run with power switch in "ON"
"COOL DOWN" or position.
1. Line voltage incorrect.
2. Power switch (S1) malfunction.
3. Fan speed switch (S3) malfunction.
4. Interconnecting wiring malfunction.
5. Motor inoperative.
Blower motor doesn’t run with power switch "ON", but
oven heats.
1. Door switch malfunction.
2. Interconnecting wiring malfunction.
3. Motor inoperative.
Blower motor doesn’t run in "Cool Down", but runs ok
in "ON" position.
1. Power switch (S1) malfunction.
2. Fan speed switch (S3) malfunction.
3. Interconnecting wiring malfunction.
Excessive or low heat in oven. 1. Line voltage incorrect.
2. Heating element malfunction.
3. Contactor malfunction.
4. Convection Fan motor malfunction.
5. Temperature probe malfunction or mechanical
thermostat malfunction.
6. Temperature control not calibrated.
7. Temperature control malfunction.
Mechanical Timer inoperative or not functioning
properly.
1. Interconnecting wiring malfunction.
2. Line voltage incorrect.
3. Timer malfunction.
Component cooling Fan does not run. 1. Motor inoperable.
2. Interconnecting wiring malfunction.
Uneven Cooking. 1. Convection Fan motor speed/direction.
2. Air flow Baffles missing or damaged.
3. Line voltage incorrect.
4. Heating element(s) malfunction.
5. Contactor malfunction.
Intermittent operation problems. 1. High ambient temperatures.
2. Wiring connections loose.
3. Cooling fan malfunction.
