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FULL SIZE GAS CONVECTION OVENS - TROUBLESHOOTING
F24682 (Rev. B, October 2007) Page 66 of 68
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 1S in COOL DOWN or
ON position.
1. Line voltage.
2. Power switch (S1) malfunction.
3. Switch (S3) malfunction.
4. Interconnecting wiring malfunction.
5. Motor inoperable.
Blower motor doesn’t run in ON position. COOL
DOWN functions OK.
1. Door switch malfunction.
2. Power switch contacts inoperative.
3. Interconnecting wiring malfunction.
Blower motor doesn’t run in COOL DOWN position.
Runs OK in ON position.
1. Power switch malfunction.
2. Interconnecting wiring malfunction.
Gas does not ignite; No spark; No Ignition Light ON. 1. Shorted electrode on ignitor/flame sense.
2. Ignitor cable (high voltage) OPEN.
3. Heat relay (R3) malfunction.
4. Transformer (T1) inoperative.
5. High limit thermostat open.
6. Interconnecting wiring malfunction.
7. Ignition Module malfunction.
Sparks but gas does not ignite. 1. Gas solenoid valve OFF or inoperative.
2. Manual gas valve CLOSED.
3. Gas supply OFF or Insufficient gas pressure.
4. Interconnecting wiring malfunction.
5. Ignition Module malfunction.
Gas ignites but will not maintain flame. 1. Igniter lead connections malfunction.
2. Ignitor ground inoperative.
3. Ignitor/flame sense malfunction.
4. Insufficient gas pressure.
5. Snorkel vent plugged, obstructed or missing.
6. Incorrect polarity from transformer (T1) to Ignition
module.
Excessive or low heat. 1. Temperature probe malfunction on models
VC4GD/6GD.
(Thermostat malfunction on models VC4GS/6GS)
2. Temperature control board malfunction.
3. Gas pressure Insufficient.
4. Gas orifice plugged or obstructed.
Mechanical Timer inoperative or not functioning
properly.
1. Interconnecting wiring malfunction.
2. Line voltage incorrect.
3. Timer malfunction.