903915A Nordyne CONTROL BOARD

903915A – Nordyne / Intertherm / Miller OEM Control Board

The 903915A is an OEM Nordyne furnace control board used in select Intertherm, Miller, and Nordyne mobile‑home furnaces. This board manages ignition, blower sequencing, safety circuits, and system operation. It is the direct replacement for units originally equipped with the 903915A board and installs without wiring modifications.

Designed to meet factory specifications, this board ensures proper timing, flame sensing, and limit‑switch monitoring. Ideal for repairing furnaces experiencing ignition failure, blower issues, or intermittent operation.

Key Features

• OEM Nordyne / Intertherm / Miller control board

• Direct replacement for 903915A

• Controls ignition, blower timing, and safety circuits

• Restores proper furnace operation

• No wiring modifications required

Common Symptoms Requiring Replacement

• Furnace won’t ignite

• Blower won’t start or won’t shut off

• Intermittent heating

• Flashing fault codes

• Burnt or damaged board components

The 903915A control board is designed for Nordyne air handler models starting with the following prefixes:

• GB3BM series

• B3BM series

• B3VM series

• B3BV series

It also replaces part number 624643 for all of these models.