or failure of the valve to open/close fully under rated pressure usually indicates that the diaphragm or plunger assembly requires replacement using an ASCO 302-308 Rebuild Kit

replacing the entire assembly is often the standard practice to ensure long-term reliability and compliance with original equipment manufacturer specifications

Engineered for normally closed operation

and RP/RPB series unit heaters

System Protection: Provides essential HVAC safety shutoff by monitoring combustion chamber and tank surface temperatures

Carrier 51771U Ignitor 318423-701 or failure of the valveThe Carrier 51771U Ignitor is a high performance Beckett PowerLight electronic oil igniter designed for direct field replacement on Beckett A, AF, AFG, and NX burners. This solid state 120VAC unit provides a robust 20kV peak output to ensure reliable ignition of the fuel air mixture, effectively replacing older, bulkier iron core transformers. The 51771U igniter features a vacuum encapsulation process using synthetic resin, which delivers superior