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| terminals. Replace as needed. |
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| Cooling fan | Line voltage should now be at the cooling fan. If voltage |
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| is present, check motor for opens, shorts or grounds. |
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| With power off, check for locked rotor. |
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| No automatic control | Incoming power supply | Check breaker, reset if required. Check power plug to |
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| box cooling |
| be sure it is firmly in receptacle. Measure incoming |
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| power, call power co. if needed. |
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| Oven cavity | Terminals are normally closed, opens at 660°F (350°C). |
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| thermostat | If open, reset and test oven for proper operation. If |
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| thermostat will not hold for maximum oven temperature, |
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| and oven is not exceeding control setting, check for |
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| proper location of capillary bulb ion its spring holder. If |
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| above checks are okay, replace |
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| Fuse, 10 amp | Check, replace if necessary. |
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| Fuse holder | Check, replace if necessary. |
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| Check for voltage on both sides of switch. Terminals are |
| |
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| box | normally closed. If open, reset and test oven for proper |
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| operation. If thermostat will not hold, and control box |
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| temperature is not exceeding 140°F (60°C), replace |
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| thermostat. |
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| Cooling fan thermostat | Check the cooling fan thermostat (thermostat closes at |
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| 120°F and opens at 100°F). With the cooling fan |
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| thermostat |
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| thermostat is open, replace cooling fan thermostat. |
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| Cooling fan | Line voltage should now be at the cooling fan. If voltage |
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| is present, check motor for opens, shorts or grounds. |
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| With power off, check for locked rotor. |
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| Oven will not heat | Main fan | If not operating, refer to “Oven fan will not run”. |
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| Control transformer | Check for supply voltage to the primary of control |
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| transformer. If no voltage is present, trace wiring back |
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| to oven fan switch. If voltage is present, check for |
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| 24VAC at transformer secondary. If there is primary |
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| voltage, but no secondary voltage, replace control |
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| transformer. |
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| Air pressure switch | Check air switch terminals for supply voltage to |
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| terminals “NO” and “COM”. If voltage is present on one |
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| side only, check for air tube blockage or misalignment. |
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| If these are okay, adjust air pressure switch or replace if |
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| necessary. |
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| Oven control | Check for 24VAC supply to oven control. If no voltage is |
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| present, trace wiring back to control transformer. Check |
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| for supply voltage to oven control. If no voltage is |
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| present, trace wiring back to oven fan switch. If voltage |
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| is present, check for a |
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| is no |
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| display. If there is a |
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| the control to maximum temperature (see Installation |
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| operation manual for temperature adjustment). With the |
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| control at maximum temperature, check for supply |
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| voltage to the mercury contactor. If there is voltage at |
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| the mercury contactor, proceed to “Mercury contactor” |
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| for next check. If there is no voltage at the mercury |
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| contactor, trace wiring back to the oven control. If there |
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| is no voltage output at the oven control, check the read- |
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| out on the oven control. If the oven control reads |
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| “PROBE FAIL” this indicates that the thermocouple has |
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| failed or become disconnected from the oven control. |
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| Thermocouple | Check to see that the thermocouple is securely |
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| connected to the oven control. If the thermocouple is |
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Impinger II – Advantage Digital Service Manual - International | 13 |