OEM Carrier Control Transformer 50VA 120/240V–24V for Model YAC3080YAC506C

This OEM step-down control transformer (part# P201-35150) is the factory-specified replacement for the Carrier YAC3080YAC506C. Its primary function is to reduce incoming line voltage — 120, 208, or 240 VAC — down to a safe 12/24 VAC to power your system's control board, thermostat circuit, and all low-voltage components. When the transformer fails, the entire control circuit goes dark: the thermostat loses communication, the board becomes unresponsive, and nothing in the system will energize — heat, cool, or fan. A failed transformer is often misdiagnosed as a bad control board, so always verify transformer output with a multimeter before replacing more expensive components.

• Specs: 50 VA rating | Primary: 120/208/240 VAC | Secondary: 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 a genuine Carrier/Totaline OEM part (P201-35150). OEM transformers are wound and insulated to exact factory VA and voltage tolerances. Undersized or off-spec generic transformers can overheat, trip thermal cutoffs prematurely, and damage downstream control boards.
• Install difficulty: 2/5 — Turn off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output post-install). Photograph all low-voltage wiring connections before disconnecting. Secondary wires typically connect to the R and C terminals on the control board.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier YAC3080YAC506C packaged or commercial HVAC unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — contact us today and get your system back online fast.