Thread: gas pven ignition coil stays lit

Inspected a gas oven today with a gas broiler. Most gas ovens I have seen have a electric broiler. The ignition coil glowed red during the operation. Is this normal? Should it not go out once the unit is lit.

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Originally Posted by ren ramsey

Inspected a gas oven today with a gas broiler. Most gas ovens I have seen have a electric broiler. The ignition coil glowed red during the operation. Is this normal? Should it not go out once the unit is lit.

Igniter is supposed to stay on as a safety function.

Actually, the Hot Surface Igniter or HSI or "glow coil" also serves as the flame proving sensor. If there is a stable, established flame, the flame rectifies an AC signal into DC microamperes, which the board is looking for and will cycle off the igniter. Should the board not see this signal in a narrow range of microamps, it will attempt a re-light trial. If the signal cannot be re-established within the specified period of seconds, the unit goes into lockout.

A Direct Spark Ignition does the same thing only you'll hear it tick, tick, ticking to ignite and it usually only waits about 4-7 seconds before it fails.

An Intermittent Pilot Ignition or IPI is the one that stays lit throughout the burn cycle. Basically, it does the same thing as above only to a pilot instead of the whole burner. Once the board sees a proper rectified signal, it allows the burners to light, usually within 1-2 seconds of the IPI pilot lighting. From there, the pilot remains lit. If the signal drops out, the main burner gas is shutoff but the IPI pilot attempts re-ignition usually for up to one minute. Some systems will shutoff for a minute then re-attempt before going into a hard lockout.
HTH