If your existing board is labeled HH84AA011

The Resideo DP2030B1003 is a professional-grade 2-pole definite purpose contactor engineered for rigorous HVACR applications

this valve assembly is designed specifically for closed-loop hydronic heating and cooling systems and should not be used for domestic water applications

ensuring system vacuum stability

The Carrier 28HQ400071 Condensate Pan is a critical OEM replacement part designed for horizontal-flow HVAC air handlers and evaporator coils

Lochinvar & A.O. Smith 100208562 Outlet Sensor 326058-755 If your existing board isMaintain the operational integrity of high efficiency hydronic systems with the Lochinvar & A. O. Smith 100208562 Outlet Sensor. This critical OEM replacement part is a 1 4" NPT outlet thermistor designed to provide precision temperature data to the Smart System control module. Engineered for Lochinvar Knight boilers and A. O. Smith Cyclone water heaters, this sensor monitors discharge water temperatures to prevent manual reset high limit (MRHL)