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The Nordyne 903429 Control Board is a critical integrated unit designed specifically for M Series gas furnaces
This unit operates on a standard 24V AC signal from the water heater or boiler control board
meaning it will re-close the circuit once system pressure drops back to the 300 PSI threshold
Universal Compatibility: Serves as the official 0386421 replacement for discontinued T1156F and 0386500 models
This unit functions with a fan switch that "makes" on temperature rise and a high-limit switch that "breaks" on temperature rise
Trane RLY2852 Relay 328140-751 The Nordyne 903429 Control BoardThe Trane RLY2852 Relay is a heavy duty 24v DPDT Relay engineered for precision switching in industrial and residential HVACR applications. As a genuine OEM Trane replacement part, this double pole double throw relay features a 24V coil designed to manage dual independent circuits simultaneously, making it an essential component for controlling compressors, fan motors, and sequencing valves. Built to withstand the rigors of high frequency cycling in
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