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Lennox HP40-024 Ignition Control Board
An ignition control board has control over gas flow, the ignition sequence and a few other devices. It has been a very important electronic safety board that, over the years, has merged to become a standard part of the main board instead of a separate board.
Clues to watch for to know the chief ignition control board needs a replacement ASAP
- Any other device in the heating and cooling system is inspected and turns out to be OK
- Signal from primary thermostat never turns up at the Lennox control board
- The ignition system declines to begin no matter what
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