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Mend Johnson and Starley J25-32 Burner Warm Runs

johnson and starley j25-32 mod airflow?

Burner starts, when warm up fan starts but only runs at a very low speed, boiler overheats shuts down.
Is this the control card or fan speed regulator.
Thanks you

dave
December 2010
Johnson and StarleyJohnson and Starley J25-32Heating, Home Heating SystemsBurner Warm Runs

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Johnson & Starley J25-32 Fan Issue - Help