Control Power OFF
|Main power not on.||Check power supply.|
|Defective control transformer.||Replace transformer.|
|Main line fuse blown.||Replace fuse.|
|Control fuse blown.||Replace fuse.|
|Short in system.||Find short and repair.|
|Bulb burned out.||Replace bulb.|
Blower switch ON, blower not running.
|Motor starter overload relay tripped.||Reset overload relay. Check motor load. If overloaded, turn off. Check blower for reason.|
|Belt broken.||Replace belt.|
|Control relay defective.||Replace relay.|
|Motor defective.||Replace motor.|
|Loose connection.||Tighten wires.|
Circulation air flow lost.
|Defective wiring (open circuit).||Find and correct defective wire.|
|Dirt in air flow switch tubing.||Clear tubing.|
|Defective air flow switch.||Replace air flow switch.|
Excessive noise and vibration.
|Blower bearings need lubrication.||Lubricate bearings. Replace bearings if needed.|
|Foreign object in fan wheel or housing.||Remove foreign object.|
|Fan out of balance.||Check for physical damage. Re-balance or replace fan wheel.|
Conveyor not running.
|Broken drive chain.||Replace chain.|
|Torque limiter not adjusted.||Adjust torque limiter.|
|Heat sensor sensing hot part.||Slow conveyor belt so parts stay longer in cooldown.|
Oven not purging.
|Bulb burned out.||Replace bulb.|
|Wire on pilot light loose.||Check and tighten wire connection.|
|Defective purge timer.||Replace purge timer.|
Pilot will not light.
|Flame safety relay tripped.||Reset flame relay.|
|Spark plug gap too wide.||Readjust spark plug for .03 approximately. Clean and re-install.|
|Pilot gas flow too weak.||Adjust pilot gas flow.|
Burner will not light.
|Low gas pressure switch set too high.||Adjust switch in accordance with gas piping.|
|Pilot gas setting too lean to monitor pilot.||Adjust pilot shut off cock needle valve for more gas. (1/4 turn at a time)|
Main burner on. Oven will not come up to temperature.
|Main burner gas cock in closed position.||Open main burner gas cock slowly.|
|Control valve not operating properly||Check for proper solenoid action. Check lead wires for continuity. Repair as needed.|
|Motorized shut off valve auxiliary switch not energized.||Check the manufacturer's instructions and adjust switch for proper operation.|
|Defective thermocouple or loose thermocouple wire||Check wire connections and tighten. Check for broken wire, replace. Check for defective thermocouple, replace.|
|Temperature control instrument out of adjustment or is defective.||Check instrument in accordance with manufacturer's manual. Replace if necessary.|
Heat switch ON: oven not heating.
|Heater circuit fuse blown.||Check and clear shorts. Replace fuse.|
|Defective thermocouple.||Replace thermocouple.|
|Defective temperature controller.||Refer to controller manual.|
Oven slow to reach temperature.
|Heater circuit fuse blown.||Check for, and clear shorts. Replace fuses.|
|Loose wires on heater elements.||Inspect and tighten wires.|
|One or more defective heating elements.||Inspect heater plug and replace defective elements.|
Poor temperature uniformity
|Poor loading practice.||Place load evenly in oven with proper clearance for air circulation.|
|Door not properly sealed.||Inspect, lubricate and adjust latching mechanism. Inspect door seals. Adjust or replace.|
|Exhaust damper not adjusted correctly||Adjust damper to correct setting. If unsure of setting consult manufacturer.|
Alarm horn sounding.
|Oven exceeding maximum temperature rating.||Temperature controller set too high. Re-adjust excess temperature controller set point. Press reset button on front of excess temperature controller.|
|Red "Excess Temperature" light is ON.||Defective thermocouple. Replace.|
|Faulty instrument adjustment.||Refer to manufacturer's instruction manual.|