OEM Carrier 40VA Control Transformer 120V/24V for Model YAC48110YAC304AC

This OEM step-down transformer (part number P201-35150) is the factory-specified replacement for Carrier YAC48110YAC304AC packaged units. The transformer steps down 120V line voltage to the 24V AC signal required to power thermostats, contactors, control boards, and all low-voltage safety circuits. When it fails, the entire control circuit goes dead — the thermostat loses power, nothing responds to a call for heating or cooling, and fuses may blow repeatedly due to a shorted secondary winding.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: P201-35150 | Factory-matched windings and insulation class
• OEM vs Generic: OEM transformers are wound and tested to Carrier's exact VA rating and insulation spec. Off-brand units often underperform under sustained 24V load, causing nuisance lockouts or premature secondary burnout.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always inspect low-voltage wiring for shorts before replacing — a shorted load will burn out a new transformer just as quickly.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model YAC48110YAC304AC. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. If you're unsure of fitment, our HVAC parts team confirms compatibility before you buy — no guesswork required.