| Main fan | If not operating, refer to “Oven fan will not run”. |
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| Centrifugal switch of main fan | Check for 120VAC at wire #5 (input to centrifugal |
| motor | switch, located at |
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| the main fan motor) to neutral. If no voltage is |
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| present, trace wiring back to the main power |
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| switch. If voltage is present, check for 120VAC at |
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| wire #22 (output of centrifugal switch) to neutral. If |
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| no voltage is present at #22, and the motor is |
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| running, replace the main fan motor. |
| Terminals are normally closed. If open, reset | |
| oven cavity | thermostat and retest. If thermostat will not hold |
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| for maximum oven temperature, and oven is not |
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| exceeding temperature setting, check for proper |
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| location of capillary bulb in its spring holder. If the |
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| capillary checks okay, replace the |
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| thermostat. |
| Burner blower motor | Check for 120VAC supplied to burner blower |
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| motor at wire #13 to neutral. If no voltage is |
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| present, trace wiring back to the main power |
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| switch. If voltage is present, and the motor is not |
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| running, check for opens, shorts or grounds. |
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| WITH POWER OFF: Turn motor to check for |
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| locked rotor. |
| Burner transformer | Check for 120VAC supplied to the primary of the |
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| burner transformer. If no voltage is present, trace |
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| wiring back to the oven cavity |
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| If voltage is present, check for 24VAC at |
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| transformer secondary. If there is primary voltage |
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| but no secondary voltage, replace burner |
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| transformer. |
| Centrifugal switch of burner | Check for 24VAC at motor connector, wire #13 to |
| blower motor | neutral. If voltage is not present, trace wiring back |
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| to transformer. If voltage is present, check for |
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| voltage at wire #14 to neutral. If no voltage is |
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| present at wire #14, and motor is running, replace |
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| burner blower motor. |
| Ignition control | Check for 24VAC at ignition control terminals |
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| marked “24V”, if no voltage is present, trace wiring |
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| back to centrifugal switch. Check for 120VAC to |
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| ignition control at terminal “L1” to neutral. If no |
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| voltage is present, trace wiring back to main |
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| power switch. When 24VAC is supplied to the |
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| ignition control, the ignition control switches |
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| 120VAC to the hot surface igniter If 24VAC and |
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| 120VAC are supplied to ignition control, but there |
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| is no voltage at the hot surface igniter, replace the |
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| ignition control. |
| Hot surface igniter | If 120VAC is present at hot surface igniter |
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| terminals, visually check to see that the igniter is |
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| heating (igniter may be viewed through the port in |
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| the end of burner tube). The igniter should glow |
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| bright red. If the igniter does not heat, replace the |
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| hot surface igniter. |
| Ignition control | After 45 seconds of hot surface igniter |
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| the ignition control will switch 23VAC to the gas |
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| control valves. Check for 24VAC output from |
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| ignition control across terminals marked “valve” |
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| and “valve gnd”. If no voltage is present, replace |
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| ignition control. |
| Gas control valves | When 24VAC is supplied to the gas control |
8 | Impinger II – Advantage Digital Service Manual - Domestic |