OEM Carrier 50VA Control Transformer P201-35150 for Model 48/140YAC-104C

The Carrier P201-35150 is the factory-specified step-down control transformer for the Carrier 48/140YAC-104C packaged unit. Its job is to reduce incoming line voltage (120/208/240V AC) down to a safe 12/24V AC to power the system's control board, thermostat, and low-voltage accessories. When this transformer fails, the entire control circuit goes dark — thermostats lose power, the system won't respond to calls for heating or cooling, and nothing turns on. It is often misdiagnosed as a failed control board, making correct identification critical before replacing costlier components.

• Specs: 50VA | Primary: 120/208/240V AC | Secondary: 12/24V AC | 60 Hz | Single-phase | CSA listed | Approx. dimensions: 3.8"L × 3.1"W × 2.2"H
• OEM vs Generic: This is a genuine Carrier/Totaline OEM part (P201-35150), manufactured to factory voltage and VA tolerances. Generic transformers may run underrated VA, causing premature thermal cutout and repeated control circuit failures — particularly under summer peak-load conditions on packaged rooftop units like the 48/140YAC-104C.
• Install difficulty: 2/5 — Shut off all power at the disconnect before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label and photograph all low-voltage wiring before disconnecting. Mount securely to avoid vibration-induced terminal fatigue.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier 48/140YAC-104C packaged unit. Verify your unit's data plate primary voltage configuration (120V, 208V, or 240V) before ordering — this transformer supports all three primary voltages. Questions about fitment? Our HVAC parts specialists verify compatibility before you order.