OEM Carrier 40VA Control Transformer P201-35150 for Model UPFLOW125UAHAC14A

This OEM step-down transformer is the factory-specified replacement for the Carrier UPFLOW125UAHAC14A upflow gas furnace. It converts 120V line voltage to 24V to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When the transformer fails, nothing in the control system responds: the thermostat goes blank, the furnace won't call for heat, and no status codes appear on the board. A blown transformer is often the silent culprit behind what looks like a complete system failure.

• Specs: Input 120VAC | Output 24VAC | 40VA rating | Factory-matched OEM part number P201-35150 | Designed to meet original Carrier performance tolerances
• OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage specs. Generic units can run under-rated VA loads, causing overheating, nuisance trips on the secondary fuse, and premature failure of downstream control boards.
• Install Difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 24V output after install), wire nuts or spade connectors. Photograph all wiring before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Directly replaces the OEM transformer in Carrier model UPFLOW125UAHAC14A upflow furnaces. Always verify your unit's data plate voltage and VA rating before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required.