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.
2.
Temperature control board malfunction.
3.
Gas pressure Insufficient.
4.
Gas orifice plugged or obstructed.
5.
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.
SG SERIES GAS CONVECTION OVENS - TROUBLESHOOTING
F45525 (0814)
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