If the blower motor fails to engage despite the burners being lit

the sensor may be dirty or defective

For lever-type applications

This Honeywell gas valve provides precise fuel regulation and ensures stable manifold pressure for consistent combustion performance

Lochinvar & A.O. Smith 100208393 Pressure Switch 319847-401 If the blower motor failsWhen you are troubleshooting a no heat call on a Lochinvar or A. O. Smith high efficiency unit, the Lochinvar & A. O. Smith 100208393 Pressure Switch is often the gatekeeper for the combustion sequence. This OEM air pressure switch is calibrated to a specific set point of 6. 20" WC, ensuring that the induced draft blower is moving enough air to support safe combustion before the gas valve is energized. As an HVAC air pressure switch replacement, this