OEM Carrier Furnace Transformer 40VA 120V to 24V — HT01CN001 for Model UPFLOW250FAU14B

The Carrier HT01CN001 is the factory-specified control circuit transformer for the Carrier UPFLOW250FAU14B upflow gas furnace. This transformer steps down 120V line voltage to a safe 24V (with 12V secondary tap) to power the furnace's entire low-voltage control circuit — including the thermostat, ignition board, gas valve, and all safety switches. When this transformer fails, the entire control system goes dark: the thermostat loses power, the furnace refuses to start, or you may notice a burning smell or audible buzzing at the transformer itself.

• Specs: 120V primary | 24V / 12V secondary | 40VA rated | Factory-matched OEM tolerances | Part #: HT01CN001 | Replaces legacy part numbers HT01BJ115, 19EA41612, 19EA42612
• OEM vs Generic: This is the genuine Carrier factory part — not a generic substitute. OEM transformers are wound and insulated to exact VA and thermal ratings for the UPFLOW250FAU14B. Undersized or off-spec generic transformers can overload immediately if control wiring has even minor resistance issues.
• Install difficulty: 2/5 — Always shut off the furnace disconnect and verify zero voltage before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all 24V wiring terminals before disconnecting. The transformer mounts to the blower compartment panel with two screws; primary and secondary leads connect to quick-connect or screw terminals.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model UPFLOW250FAU14B. Verify your existing transformer's primary voltage (120V), secondary voltage (24V/12V), and VA rating (40VA) on the unit's data plate or existing transformer label before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required.