Armstrong Furnace R40403-003 Control Board

The Armstrong Furnace R40403-003 is a direct OEM replacement blower control fan timer board, engineered to regulate the timing and sequence of the indoor blower motor in residential forced-air systems. This furnace control board is the designated successor to the discontinued 40403-001 model, offering exact form-fit-function for 80% and 90%+ AFUE gas furnaces. As a solid-state timer board, the R40403-003 manages internal safety logic and fan-off delays to ensure optimized thermal exchange and heat exchanger cooling cycles. For field technicians, this Armstrong blower control features standardized spade terminal connections for straightforward wiring and integration with existing 24V transformers and limit circuits. This HVAC replacement part is essential for resolving intermittent fan failures or ignition sequence errors, maintaining the precise operational parameters required for high-efficiency Armstrong and AirEase systems.

• Direct OEM Replacement: Replaces legacy part number 40403-001 with updated circuitry for reliable fan timer control.
• Optimized Logic: Pre-configured fan-off delay settings protect the heat exchanger from thermal stress.
• Enhanced Durability: Solid-state architecture resists moisture and high-temperature cabinet environments better than older mechanical relays.
• Standardized Interface: Industry-standard terminal labeling simplifies troubleshooting and field installation.

Is the R40403-003 compatible with older 40403-001 units?
Yes, the R40403-003 is the official updated version specifically designed to replace the 40403-001 blower control board.

What are the symptoms of a failing blower fan timer board?
Common indicators include the blower motor failing to engage after the burner ignites or the fan remaining active indefinitely after the heating cycle ends.

Does this board control the gas valve or ignition?
This specific board functions primarily as a blower control and fan timer; always verify your furnace’s wiring diagram to confirm if your model utilizes a separate primary integrated ignition control.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.