Armstrong Furnace R37883B001 Sequencer Relay and 3155 Series units

and 3155 Series units

the issue may lie with the UCM or the inlet valve

Exact Compatibility: Purpose-built for Honeywell MP953A and MP953C 5-inch pneumatic actuators

This beige metal thermostat guard features a robust heavy-duty steel enclosure with a 22-gauge frame and an 8-gauge cover

Durable Construction: Designed for longevity in demanding environments

Armstrong Furnace R37883B001 Sequencer Relay and 3155 Series unitsFor high performance staging in electric heat applications and gas furnace control circuits, the Armstrong Furnace R37883B001 Sequencer Relay is a critical OEM replacement part designed to regulate the timing of heating elements and blower motors. This HVAC sequencer relay utilizes a thermally actuated bimetal disc to ensure staggered activation, preventing massive electrical surges that can trip breakers during high load startups. Experienced