Lennox 81G65 Relay 318820-201 always verify that the appliance's

always verify that the appliance's ignition sequence does not specifically require a slow-opening characteristic for delayed main burner ignition

technicians should verify 120V at the leads during a call for heat and inspect for common mechanical issues such as seized bearings or cracked housings that compromise the pressure switch circuit

this unit serves as the direct replacement for Fasco D564

While the switch itself is a rugged mechanical component

Lennox 81G65 Relay 318820-201 always verify that the appliance'sThe Lennox 81G65 Latching Relay is a specialized DPDT (Double Pole Double Throw) control component engineered for precise electrical switching in commercial and residential HVAC systems. Operating on a 24VAC 50 60Hz coil, this relay utilizes a magnetic latching mechanism that maintains its contact state without requiring a continuous power signal. This design is essential for HVAC lockout circuits and energy saving control logic where maintaining