OEM Carrier Control Transformer 40VA 120V to 24V for Model UPFLOW250UA14B

This OEM Carrier transformer (part #HT01CN001) is the factory-specified replacement for the Carrier UPFLOW250UA14B upflow gas furnace. The transformer steps down the 120V line voltage to a safe 24V (with a 12V tap) to power your furnace's low-voltage control circuit — including the thermostat, gas valve, and ignition board. When it fails, the entire control circuit goes dark: the thermostat loses power, the system refuses to start, and you may hear a faint buzz or hum from the transformer housing.

• Specs: 120V primary | 12V/24V secondary | 40VA rated | Factory Authorized Part — direct OEM replacement with no modifications required
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for the UPFLOW250UA14B control board. Undersized or off-tolerance generic units risk nuisance tripping of the internal thermal overload, leaving you with an intermittent no-heat condition that's difficult to diagnose.
• Install difficulty: 2/5 — Turn off power at the breaker and confirm zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label and photograph all low-voltage wiring connections before disconnecting. The transformer mounts in the control compartment with standard screws and uses push-on or screw terminals.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier UPFLOW250UA14B upflow gas furnace. Replaces legacy part numbers HT01BJ115 and 19EA41612. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating (40VA) on the data plate before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get your heat back today.