Persistent ignition failure often indicates a depleted thermopile or a clogged LP orifice

the Carrier HH18HA211 should show continuity across the terminals since it is a normally closed (NC) switch

contractors can significantly reduce energy overhead by preventing the over-ventilation of unoccupied spaces while maintaining compliance with ASHRAE 62

What causes a hot surface ignitor to fail

Key Benefits Enhanced Thermal Resistance: The Class H coil and Teflon seals allow for stable operation in high-temperature fluid applications

Armstrong International 881-3/4-125 Trap Els PW 29614 Persistent ignition failure often indicatesThe Armstrong International 881 3 4 125 is a high performance inverted bucket steam trap engineered for reliable condensate removal in industrial steam systems. Constructed with a rugged cast iron body and featuring an integral strainer, this Series 881 trap is designed for horizontal in line installation. It operates at a maximum pressure of 125 PSI and utilizes a precision ground 1 8" orifice to maintain peak efficiency. The unique inverted bucket