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8.0 TROUBLE-SHOOTING
No Heat:
1. The branch circuits serving the oven are dead.
2. Oven cord plug is not in its receptacle.
3. Oven power switch is open (off).
4. The temperature controller is set too low.
5. The overtemperature safety is set too low. It must be higher than the controller.
6. The controller's Thermocouple temperature sensor is open circuited.
7. The solid state relay is open circuited.
8. Line contactors have failed open circuited. (Model TFO-28)
9. The overtemperature safety has failed open circuited.
10. A heater element has failed.
The Controller Calls For Heat Constantly:
1. The controller's Thermocouple temperature sensor has failed. Oven temperature is now controlled
by the overtemperature safety.
2. A solid state relay has failed closed. Temperature is now controlled by the overtemperature safety.
Blower Does Not Run (Heater Heats):
1. Motor leads are disconnected at terminal blocks.
2. Either the motor or blower wheel is jammed.
Blower Runs, But Air Volume is Reduced:
1. Impeller and plenum are dirty.