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