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Lennox G40UH-24A-045 Control Board
Your system definitely will not function unless this important circuit board is accurately installed and configured. The control board is created to control everything including the gas valve, the igniter, the flame sensor as well as the blower all at once. The proper control board must have a matching part number consistent with both the brand and specific model of your heating and cooling system. You should always be careful when you choose a control board due to differences in brands, models and types of systems.
Symptoms of a dying main circuit board
- There may be some sort of error code shown directly on the board
- The unit refuses to go at all
- Power to the control board has to be powered down and back up quite a lot for it to run
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