OEM Carrier 40VA Control Transformer P201-35150 for Model UPFLOW125UA%14

This is the factory OEM replacement control transformer for the Carrier UPFLOW125UA%14 upflow gas furnace. The transformer steps down line voltage from 120V to 24V AC to power the furnace's low-voltage control circuit — including the thermostat, control board, gas valve, and safety switches. When this transformer fails, the entire control circuit goes dead: the thermostat displays nothing, the furnace won't respond to any call for heat, and no fault codes are produced because the board itself has no power.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number P201-35150 | Factory-matched for Carrier UPFLOW125UA%14 upflow furnaces
• OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage tolerances. Undersized or off-spec generic units can sag under load, causing nuisance lockouts, erratic board behavior, or premature transformer burnout — especially in systems with multiple 24V accessories (humidifiers, zone boards, UV lights).
• Install difficulty: 2/5 — Shut off power and gas before starting. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper, needle-nose pliers. Always verify 24V output with a multimeter after installation before restoring full system power. Photograph all wiring connections before disconnecting.
• Warranty: 1-year OEM factory warranty included. Orders ship same business day from our stocked warehouse.

Compatibility: Direct OEM replacement for Carrier model UPFLOW125UA%14 upflow gas furnaces. Verify primary voltage (120V) and VA rating on your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility before you buy — contact us with your full model and serial number.