If your existing board is labeled HH84AA011

Simplified Integration: Standardized mounting footprint and terminal layout reduce downtime during field replacements

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

Industrial-Grade Durability: The forged brass body and chrome-plated brass trim provide a static pressure rating of 580 psig

ensuring system vacuum stability

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)