| Burner control | Check for supply voltage at terminal #7 on burner |
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| control. If no voltage is present, trace wiring back to air |
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| pressure switch. If voltage is present, check for output |
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| voltage (after the 30 second delay) from terminal #8 on |
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| the burner control. If there is no output voltage from |
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| terminal #8, (after the 30 second delay) replace the |
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| burner control. If there is output voltage, proceed. |
| Pilot valve | Check for supply voltage to pilot valve. If no voltage is |
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| present, trace wiring back to burner control. If voltage is |
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| present, check for gas pressure at the pilot line |
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| connection. If no gas pressure is present during |
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| ignition, check for any blockage in the assembly. If |
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| there are no obstructions, and there is gas supplied to |
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| the oven, replace the gas valve. |
| Burner control | Check to see that the high voltage igniter circuit on the |
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| burner control is energized. To check, turn power off, |
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| disconnect the igniter lead from the burner control. Turn |
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| power on. If no spark is visible, replace burner control. |
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| If a spark is visible at burner control, proceed. |
| Burner igniter | Check the burner igniter head for any damage or |
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| obstructions also check for frayed or broken wire. |
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| Check spark gap, gap should be 3/32” If there is visible |
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| damage, replace burner igniter. |
| No pilot flame | If there is supply voltage to the burner control, and the |
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| pilot valve and igniter circuits are energized, visually |
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| check for a pilot flame. This may be done by looking |
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| through the inspection view port on the end of the |
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| burner. If no pilot flame is visible, check the pilot tube. |
| Pilot tube | Check for gas pressure at the pilot tube. Disconnect |
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| pilot tube at the burner and connect manometer to pilot |
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| tube. If no gas pressure is present during ignition, |
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| check for blockage of the pilot tube. If the pilot tube is |
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| clear, proceed. |
| Pilot orifice | If there is gas pressure at the pilot tube, check the pilot |
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| orifice for blockage or obstructions. Replace pilot orifice |
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| as needed. |
| Burner igniter | Check the burner igniter head for any damage or |
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| obstructions also check for frayed or broken wire. |
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| Check spark gap, gap should be 3/32” If there is visible |
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| damage, replace burner igniter. |
| Flame sensor | (There should be a visible pilot flame at this time.) |
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| To check for proper flame sensor operation, connect a |
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| digital multimeter (capable of measuring D.C. micro |
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| amps) in series between the flame sensor wire |
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| (normally connected to terminal #13 on the burner |
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| control) and terminal #13 on the burner control. With a |
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| visible pilot flame, the current reading should be 0.7 |
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| micro amp minimum. NOTE: The D.C. micro amp test |
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| must be conducted with the oven in low flame operation |
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| only. If these values are not achieved, replace flame |
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| sensor. Also check for any type of damage to flame |
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| sensor wire and connections. |
| Power supply | If there is a pilot flame, and there is sufficient micro |
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| amp. current, but the flame will not stay on, check for |
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| proper polarity of the power supply. |
| Burner control | If there is sufficient micro amp current, and there is |
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| proper polarity of the power supply, but the burner will |
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| not stay on, check the reset button for the burner |
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| control. If the reset switch checks okay, replace the |
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| burner control. |
Pilot flame, but no main flame | NOTE: Flame should be | Check for supply voltage to electronic temperature |
Impinger X2 – Analog Service Manual – Dom & Int’l | 13 |
