Description
The Armstrong Furnace R100306-02 is a factory-specified pressure switch engineered to protect and regulate your Armstrong furnace’s draft inducer operation. Rated at 0.3″ w.c. (inches water column), this switch monitors negative pressure in the flue system and prevents the furnace from firing if proper draft conditions are not met — a critical safety and performance function in modern induced-draft and condensing gas furnaces.
Key Features
- OEM-specified replacement pressure switch for Armstrong Furnace equipment
- Rated setpoint: 0.3″ w.c. (inches water column)
- Monitors draft inducer pressure to ensure safe furnace ignition
- Helps prevent unsafe operation under improper venting or blocked flue conditions
- Direct OEM replacement for accurate fit and reliable performance
- Designed to meet original equipment specifications
Why Replace Your Pressure Switch?
A faulty pressure switch is one of the most common causes of furnace lockout and no-heat calls. When the switch fails to close — or fails to open — the furnace control board cannot confirm safe draft conditions, resulting in ignition lockout or nuisance shutdowns. Replacing with the correct OEM part (R100306-02) ensures the switch operates at the precise setpoint your furnace was designed for.
Compatibility
- Designed for use with Armstrong Furnace equipment requiring a 0.3″ w.c. pressure switch
- Always verify compatibility with your specific furnace model number before installation
Installation Notes
- Disconnect power before servicing
- Inspect inducer motor, hoses, and pressure ports for blockages before replacing the switch
- Match hose connections and electrical terminals to original configuration
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