OEM Carrier 50VA Control Transformer 120/208/240–12/24V for Model YAC1840YACX101K

This is the factory-specified OEM replacement control transformer (Part # P201-35150) for the Carrier YAC1840YACX101K HVAC system. The transformer steps down high-voltage line power (120/208/240 VAC) to the safe low-voltage signal (12/24 VAC) that powers your system's control board, thermostat, and all low-voltage control circuits. When this transformer fails, the entire control circuit goes dark — the thermostat loses power, the system won't respond to any call for heating or cooling, and the blower may run continuously or not at all. Replacing the transformer with the correct OEM part restores full system control immediately.

• Specs: 50 VA rating | Primary: 120/208/240 VAC | Secondary: 12/24 VAC | 60 Hz | Single phase | CSA listed | OEM Part # P201-35150
• OEM vs Generic: This OEM transformer is factory-wound to exact VA and voltage tolerances for the Carrier YAC1840YACX101K. Generic transformers often underperform at rated VA, causing nuisance tripping of the internal fuse and premature control board failure.
• Install Difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Label all wiring before removal. Replace the inline 3A fuse on the secondary circuit if it has blown.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model YAC1840YACX101K. Verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy — reach out before placing your order.