OEM Carrier 40VA Transformer for Model HUMBBSBP2212A — Part P201-2201

This is the factory-specified OEM step-down transformer for the Carrier HUMBBSBP2212A whole-home bypass humidifier. The transformer converts 120V line voltage to 24V AC to power the humidifier's control circuit, solenoid valve, and humidistat. When the transformer fails, the entire control circuit goes dead — the solenoid valve won't open, the humidistat loses power, and humidity control stops completely. If nothing responds when the humidistat calls for humidity, a failed transformer is one of the first components to test.

• Specs: 40VA rating | 120V primary input | 24V AC secondary output | OEM part number P201-2201 | Factory-matched output tolerance for reliable solenoid and control board operation
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage specifications, ensuring stable 24V output under load. Undersized or off-spec generic transformers can cause erratic solenoid behavior, nuisance lockouts, and premature control board failure.
• Install difficulty: 2/5 — Shut off power to the humidifier and furnace before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Use the multimeter to verify 0V at the transformer terminals before touching any wiring. Photograph all wire connections before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders ship the same business day from our warehouse.

Compatibility: Designed for the Carrier HUMBBSBP2212A bypass-style whole-home humidifier. Confirm your unit's data plate shows 120V input and 24V control voltage before ordering — this transformer is not rated for 240V primary applications. If you're unsure of fitment, our team verifies compatibility before you buy. Order now and this part ships today.