Upgraded ROBOA R40403-003 Furnace Blower Control Board Replacement For ST9120 A B C And 40403-001 40403-002 40403-003 Direct Fit Compatible With Armstrong Allied Ducane Magic Chef

Direct single unit furnace blower control board for ST9120 ✔️ Replaces R40403-001/002/003; fits ST9120A/B/C control

This upgraded furnace blower control board is a direct plug-and-play replacement designed for residential furnaces using ST9120 controls. It's compatible with Armstrong, Allied, Ducane, Magic Chef, and other major brands, providing dependable performance in a wide range of systems.

✅ Direct replacement for R40403-001/002/003 and 20054502
✅ Compatible with ST9120A/B/C controls and Armstrong Allied brands
✅ Operating Line Voltage: 85-135 VAC, 50/60Hz; Secondary 18-30 VAC
✅ Max Blower Load: 15FLA/30LRA @120VAC; Max Inducer Load: 3FLA/10LRA @120VAC
✅ 5-amp replaceable fuse for 24V circuit; dip switch for blower delay
✅ Moisture and corrosion resistant PCB for long-term performance

💡 What is a furnace blower control board used for? This handy module acts as the brain of your furnace blower, managing speeds, sequencing, and safety interlocks across heating cycles. - It coordinates blower motor operation and blower delay timing - It handles main power 85-135 VAC and control voltage 18-30 VAC with built-in protection - It enables plug-and-play replacement for ST9120 controls and 40403 variants