On a call for heat

Whether you are integrating a 24V control circuit or expanding BAS peripheral capacity

cracked ceramic insulators on the ignitor/sensor lead often lead to grounding issues

Verify the resistance using a multimeter

White-Rodgers 1F85U-42NP Thermostat Els PW 17895 On a call for heatThe White Rodgers 1F85U 42NP is a versatile 80 Series Universal Staging Thermostat designed for high performance reliability in 2 Heat 2 Cool conventional systems or up to 4 Heat 2 Cool heat pump applications. This non programmable thermostat supports dual fuel control without requiring an external outdoor sensor, making it a robust choice for contractors managing complex HVAC configurations. It operates via 20 30Vac hardwire or battery power for