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I bought a new circuit board for my Goodman GMP100-4 furnace (the blower came on and off periodically without command for heat or air). The new board B1809913 did not come with a wiring schematic....

Thanks folks,

I'll try your ideas. Sounds like that is probably the problem.

Thanks again,

I have a forced air furnace. The air circulation fan has started coming on whenever it pleases. Even with the thermostat shut off. There is only two position for fan and they are "on" and "auto".
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