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I am thinking it gets too hot because the unit makes a humming sound not coming from the fan but like an air gas mix hum if I move the orifice closer into the air gas ventury it quiets down. and I`m wondering why they had that jumper wire going from line to fan.
I thought the fan would be turned on and off as the plenum temp changed up and down.
isn`t the fan controlled by the fan phase of that switch?