OEM Carrier 40VA Control Transformer for Model YAC48110YACX204AC

This is the factory OEM replacement transformer (part number P201-35150) for the Carrier YAC48110YACX204AC packaged unit. The transformer steps down 120V line voltage to the 24V AC signal required by your thermostat, control board, and all low-voltage system components. When this part fails, the entire control circuit goes dark — the thermostat loses power, the system will not respond to any call for heating or cooling, and no low-voltage components will operate. A failed transformer is one of the most common causes of a completely unresponsive HVAC system.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | Direct OEM factory replacement for P201-35150
• OEM vs Generic: This OEM unit is wound and insulated to Carrier's exact VA rating and thermal protection specs. Generic transformers often underrate true VA capacity, leading to premature burnout under normal system load — especially when multiple zones or accessories draw simultaneous current.
• Install Difficulty: 2/5 — Disconnect all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wiring connections before disconnecting the old transformer. Confirm fuse integrity on the 24V circuit before condemning the transformer.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for Carrier model YAC48110YACX204AC. Always verify OEM part number P201-35150 against your unit's data plate and wiring diagram before ordering. Our fitment team is available to confirm compatibility — contact us before you order if you have any questions.