OEM Carrier 50VA Control Circuit Transformer P201-35150 for Model UPFLOW100UA%14

This is the genuine OEM factory-specified step-down transformer for the Carrier UPFLOW100UA%14 air handler. The transformer converts incoming line voltage (120/208/240 VAC) to a safe 24V AC signal that powers the control board, thermostat, and all low-voltage control circuits throughout the system. When this transformer fails, the entire control circuit goes dark — symptoms include a completely unresponsive thermostat, a system that won't energize at all, tripped low-voltage fuses, or intermittent lockouts with no error codes. Replacing it with the correct OEM unit restores full control circuit integrity immediately.

• Specs: 50 VA rating | Primary: 120/208/240 VAC multi-tap | Secondary: 12/24 VAC | 60 Hz | Single phase | CSA listed | Dimensions: 3.8″L × 3.1″W × 2.2″H
• OEM vs Generic: This OEM Carrier/Totaline transformer (P201-35150) is factory-wound to exact VA and voltage tolerances. Generic transformers often fall short of rated VA under load, causing nuisance tripping of the secondary fuse and premature control board damage — especially in multi-stage systems drawing full 50VA.
• Install difficulty: 3/5 — Shut off ALL power at the breaker and air handler disconnect before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output post-install), wire nuts or push-in connectors. Label all low-voltage wires before disconnecting. Confirm primary tap matches your supply voltage before energizing.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-matched replacement for Carrier model UPFLOW100UA%14 air handlers. Cross-references: Totaline P201-35150, also identified by Carrier part alias HCTY156D0LS11102. Verify your unit's data plate shows 120/208/240V primary and 24V secondary before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — order with confidence and get your system back online today.