OEM Carrier Control Transformer 50VA 120/208/240V–12/24V for Model YAC36100YAC108T (P201-35150)

This OEM Carrier step-down transformer (part number P201-35150) is the factory-specified replacement for the Carrier YAC36100YAC108T HVAC system. The transformer converts high-voltage line power (120/208/240 VAC) down to safe 12/24 VAC to energize your system's control board, thermostat, relays, and contactor coils. When the transformer fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, the system stops responding to calls for heating or cooling, and nothing turns on. If you're measuring 0 VAC on the secondary side of the transformer, this is your part.

• Specs: 50VA rated | Primary voltage: 120/208/240 VAC multi-tap | Secondary voltage: 12/24 VAC | 60 Hz single-phase | CSA listed | Dimensions approx. 3.8″L × 3.1″W × 2.2″H
• OEM vs Generic: This is the genuine Carrier/Totaline factory part (P201-35150), manufactured to exact VA and voltage tolerance specifications. Generic transformers often use undersized cores that overheat under full load, tripping the internal thermal fuse and causing repeat failures — especially on systems with high contactor coil draw.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching wires and verify 24V output after install). Label and photograph all wiring terminals before disconnecting. The transformer mounts via foot or bracket depending on your air handler cabinet.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-matched replacement for the Carrier YAC36100YAC108T. This transformer is also cross-referenced under the Totaline brand (P201-35150) and is used across multiple Carrier, Bryant, and Payne platforms sharing the same control circuit architecture. Always confirm your unit's data plate shows 50VA / 120–240V primary before ordering. Have a fitment question? Our HVAC parts team verifies compatibility before you buy — just reach out before placing your order.