If the sequencer is hot to the touch but the contacts remain open

As a veteran-grade OEM component

The Cleveland Controls DFS-448-452 is a fixed-set-point air pressure sensing switch designed for critical airflow proving in duct heaters

5W) while providing high-seating force

Built with a durable frame and high-quality bearings

Conbraco 10-614-09 Valve Els PW 17895 If the sequencer is hotThe Conbraco 10 614 09 is a high capacity hot water pressure relief valve engineered for critical overpressure protection in heavy duty hydronic heating systems and commercial boilers. Constructed with a rugged bronze body and a corrosion resistant spring cage, this ASME Section IV certified valve is factory set at 45 PSI to ensure system integrity during runaway firing or control failure. With a massive 1,306,000 BTU capacity, it manages high volume