Troubleshooting; All Models - Vulcan-Hart VC4EC Service Manual

FULL SIZE ELECTRIC CONVECTION OVENS - 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.
SYMPTOMS
Blower motor doesn't run with power switch in "ON"
"COOL DOWN" or position.
Blower motor doesn't run with power switch "ON", but
oven heats.
Blower motor doesn't run in "Cool Down", but runs ok
in "ON" position.
Excessive or low heat in oven.
Mechanical Timer inoperative or not functioning
properly.
Component cooling Fan does not run.
Uneven Cooking.
Intermittent operation problems.
F25105 (Rev. A, October 2007)

TROUBLESHOOTING

ALL MODELS

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POSSIBLE CAUSES
1. Line voltage incorrect.
2. Power switch (S1) malfunction.
3. Fan speed switch (S3) malfunction.
4. Interconnecting wiring malfunction.
5. Motor inoperative.
1. Door switch malfunction.
2. Interconnecting wiring malfunction.
3. Motor inoperative.
1. Power switch (S1) malfunction.
2. Fan speed switch (S3) malfunction.
3. Interconnecting wiring malfunction.
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.
1. Interconnecting wiring malfunction.
2. Line voltage incorrect.
3. Timer malfunction.
1. Motor inoperable.
2. Interconnecting wiring malfunction.
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.
1. High ambient temperatures.
2. Wiring connections loose.
3. Cooling fan malfunction.