TROUBLESHOOTING GUIDE / ELECTRIC OVENS
MODEL | 208 VAC | SINGLE PHASE | 60 HZ |
MODEL | 240 VAC | SINGLE PHASE | 60 HZ |
MODEL | 208 VAC | THREE PHASE | 60 HZ |
MODEL | 240 VAC | THREE PHASE | 60 HZ |
| REFER TO PROPER SCHEMATIC FOR IDENTIFIED COMPONENTS | |
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SYMPTOM | POSSIBLE CAUSE | EVALUATION |
Oven fan will not run | Incoming Power Supply | Check circuit breakers. Rest if required. Call |
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| power company in needed. |
| Fuses, 10 Amp, Fan and | Check, replace if necessary. |
| Controls |
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| Fuseholder | Check, replace if necessary. |
| Control Box High Limit | Terminals are normally closed, but open at 140°F ± |
| Thermostat | 5°F (60°C ± 2.8°C). Check for over heating and |
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| reset thermostat. Test for proper operation. If it will |
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| not reset and hold, then replace. |
| Switch, Main Fan | Check for continuity between switch terminals. |
| Main Fan Motor | Check for opens, shorts, or grounds. WITH |
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| POWER OFF: Turn fan blade to check for locked |
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| rotor. |
| Capacitor | Check for opens, shorts, or grounds. |
No control box cooling |
| Check for main fan operation. If not operating, refer |
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| to "Oven Fan Will Not Run". |
| Cooling Fan Motor | 208/240 VAC should be present at the fan motor. If |
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| voltage is present, check for opens or shorts. |
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| WITH POWER OFF: Check for locked rotor of the |
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| fan motor. |
No automatic control | Incoming Power Supply | Check circuit breakers. Reset if required. Call |
box cooling |
| power company if needed. |
| Thermostat, Cooling Fan | This normally open thermostat should close when |
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| the temperature in the control box reaches 120°F |
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| (48.9°C). If thermostat does to close, replace. |
| Cooling Fan Motor | 208/240 VAC should be present at the fan motor. If |
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| voltage is present, check for opens or short. WITH |
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| POWER OFF: Check for locked rotor of the fan |
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| motor. |
Control box cooling fan | Thermostat, Cooling Fan | This normally open thermostat should close at |
continues to run |
| 120°F (48.9°C) and reopen at 100°F (37.8°C). |
Oven will not heat | Main Fan Motor | Check for main fan operation. If it is not operating, |
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| refer to "Oven fan will not run". |
| Air Pressure Switch | This normally open switch should close when the |
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| main fan is activated. Adjust if necessary (Refer to |
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| page 23). Replace if defective. |
| Terminals are normally closed. If open, reset and | |
| Cavity | test oven for proper operation. If thermostat will not |
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| hold for maximum oven temperature, and oven is |
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| not exceeding temperature dial setting, check for |
proper location of capillary bulb in its spring holder. If above checks okay, replace
Impinger II | 13 |