Nordyne 903429 Integrated Furnace Control Board – M1 Series

Specifications

• Part Number: 903429
• Brand: Nordyne / Nortek
• Product Type: Integrated Furnace Control Board
• Application: Gas / Oil Furnace
• Furnace Series: M1 Series
• Input Voltage: 120 VAC, 60 Hz
• Control Voltage: 18–30 VAC
• Ignition: Hot Surface Ignition
• OEM Part: 903429
• Current Replacement: 903429A

The 903429 is an integrated furnace control used in Nordyne M1-series equipment. The original 903429 has been discontinued and is now replaced by 903429A.

Replacement & Cross-Reference Part Numbers

The 903429 / 903429A replaces or cross-references with:

• 903429
• 903429A
• 624602
• 6246020
• 624602-0
• 624602A
• 624602B
• 624640
• 624640-A
• 1012-93-9581A
• 1012-012-958A
• 233089

ICM specifically lists 903429, 624602, 624640, 1012-93-9581A, 1012-012-958A and 233089 as boards replaced by its ICM2818 Nordyne replacement control.

Nordyne 903429 Furnace Control Board

The Nordyne 903429 is an integrated furnace control board used in select Nordyne, Miller and Intertherm M1-series furnaces.

The control board manages the furnace operating sequence, including:

• Induced draft blower
• Circulating blower
• Hot surface ignitor
• Gas valve
• Flame sensing
• Furnace safety monitoring
• Diagnostic fault operation

The board receives thermostat and furnace safety inputs and controls the appropriate components throughout the heating cycle.

Compatible Furnace Series

The 903429 is documented for M1 Series furnaces, including M1M-A/B/C/D applications.

Known compatible models include:

• M1MA056AAW
• M1MA056ABW
• M1MA070AAW
• M1MA070ABW
• M1MB056AAW
• M1MB090
• M1MD090
• M1MAH070

Parts data specifically identifies these as applications for the 903429 control.

903429A Replacement for 903429

The original Nordyne 903429 has been discontinued. The direct replacement is 903429A.

The newer 903429A version requires a flame sensor to be added, and replacement kits may include the required flame sensor.

This is an important distinction when replacing an older 903429 board.

Common Symptoms of a Failed Furnace Control Board

• Furnace will not start
• Inducer motor does not energize
• Hot surface ignitor does not energize
• Gas valve does not receive power
• Circulating blower does not operate
• Blower runs continuously
• Furnace starts and then shuts down
• Intermittent furnace operation
• Furnace goes into safety lockout
• Control board does not properly sequence furnace operation

Other furnace components can produce similar symptoms, so the control board should be properly diagnosed before replacement.

Buy Nordyne 903429 / 903429A Control Board in Canada

Buy the Nordyne 903429 / 903429A Integrated Furnace Control Board from OemHvacPartsCanada.ca.