Speedaire model 4B221 with a 4B225 pump.

Unit will not shut off by itself. What part need to be replaced? Thank You

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Bill says...

In the absence of a lot more info, all I can surmise is that you have a pressure switch problem, as the pressure switch is the device that turns the compressor on a low cut in pressure, and off at the high cut out pressure point.

Cheers,

Bill