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OV500 SERIES RACK OVEN - TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSES
Rack does not lower when rack stops in
load/unload position when door is opened during
or at end of bake cycle.
1. Door switch malfunction.
2. Lift motor or OL2 open.
3. Controller malfunction.
4. Mechanical bind due to actuator or lift shaft.
5. LS2 inoperative.
Rack stops in wrong position or doesn't stop after
door is opened.
1. Rack pointer switch out of adjustment.
2. Rack position switches not adjusted or inoperative.
3. CR3 malfunction.
4. CR4 malfunction.
5. Carrier set screws loose.
No steam or low volume of steam. 1. Water supply to oven not on.
2. Incoming water pressure too low.
3. Solenoid valve malfunction.
4. Control malfunction.
5. Vent open or vent switch malfunction.
Excessive moisture in oven. 1. Solenoid valve sticking open.
2. Drain clogged or plumbed incorrectly.
3. Malfunctioning water pressure regulator.
4. Excessive water pressure.
Recovery time slow after steaming. 1. Excessive water input.
2. Program set point incorrect.
3. Hysteresis programed incorrectly.
4. Gas supply pressure improperly adjusted.
5. Cavity vent open.
Incorrect heat. 1. Control not calibrated.
2. Control in incorrect temperature mode (EF vs.EC).
3. Temperature probe malfunction.
4. Circulation fan motor malfunction.
5. See BURNER TROUBLESHOOTING.
Burner does not light. 1. No output from controller.
2. Door open or door switch inoperative.
3. See BURNER TROUBLESHOOTING.
High or low draft pressure in oven draft inducer. 1. Draft inducer motor or fan malfunction.
2. Draft inducer fan blade not positioned on motor shaft
correctly.
3. Damaged draft inducer fan blade.
4. Roof mounted fan too large (high pressure) or too small
(low pressure).
Lights do not work. 1. Bulbs burned out.
2. Control program set to OFF.
3. Incorrect supply voltage.
Uneven baking. 1. Circulation fan loose on motor shaft or damaged.
2. Obstruction in air channels.
3. Circulation motor(s) inoperative.
4. Air and angle shutters not adjusted correctly.
F25361 (January 2010)
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