OEM Carrier 40VA Control Transformer 120V to 24V for Model P1100049BG

This OEM replacement transformer (part number P201-35150) is the factory-specified control circuit transformer for the Carrier P1100049BG unit. Its sole but critical job is stepping down 120V line voltage to the 24V signal voltage that powers your thermostat, contactor coil, and all low-voltage control components. When this transformer fails, the entire control circuit goes dark — the thermostat appears dead, the system makes no response to a call for heating or cooling, and no fault codes are generated because the board itself has lost power.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part P201-35150 | Class 2 transformer | Replaces factory-installed unit on Carrier P1100049BG
• OEM vs Generic: The OEM unit meets Carrier's exact VA rating and insulation class, ensuring the control board and thermostat receive stable, clean 24V output. Undersized generic transformers can overheat under combined load from contactor coils and accessories, causing nuisance shutdowns and premature failure.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wire connections before removal. Verify output voltage with a multimeter after installation before closing the panel.
• Warranty: 1-year OEM factory warranty included. In-stock units ship same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed as the direct OEM replacement transformer for Carrier model P1100049BG. Always confirm the VA rating and primary/secondary voltages on your existing transformer's label match before ordering. If you are unsure of fitment, our HVAC parts specialists can verify compatibility before you buy — same-day shipping guaranteed on in-stock orders.