Lennox 78H55 Transformer this part is the designated

this part is the designated technical replacement for the legacy 626429 and 201715 switches used in Intertherm and Miller E1 series electric furnaces

Universal Compatibility: Designed for high condensing temperatures and compatible with most HCFC and HFC refrigerants

Utilizing genuine Bradford White replacement parts ensures the manifold pressure and thermal safety parameters remain within original manufacturer tolerances for reliable long-term operation

This indicates the vent float kit is not seating correctly or the spring has lost tension

it is rated for 3A at 277V

Lennox 78H55 Transformer this part is the designatedThe Lennox 78H55 Transformer is a critical OEM replacement part designed for HVAC 24V control circuits. This step down transformer converts a 120V primary input to a stable 24V secondary output, providing the necessary low voltage power for contactor coils, ignition modules, and thermostats. With a 30VA power rating, it is engineered for consistent performance in residential and light commercial air handlers and furnaces. This unit serves as the