the second check assembly is likely fouled or damaged

This specific part is compatible with several Utica-Dunkirk hydronic heating models

you should read approximately 10

reduce fuel consumption

WSHP Control Module

Carrier HN67QC006 Sequencer L99H008 the second check assembly isThe Carrier HN67QC006 Sequencer is a critical OEM replacement part designed for staggering the activation of electric heating elements in residential and commercial furnaces. By utilizing a 24V control circuit to actuate terminal switches, this two stage sequencer prevents massive inrush current and potential circuit breaker trips. It manages the resistive load by ensuring heating coils and the blower motor are staged logically, typically featuring an