OEM Carrier Furnace Transformer 120V to 24V 40VA for Model UPFLOW200U9020AL

The Carrier HT01CN001 is the factory-specified control circuit transformer for the UPFLOW200U9020AL upflow gas furnace. It steps down 120V line voltage to a safe 12/24V secondary output at 40VA, supplying power to the thermostat, control board, and all low-voltage components. When this transformer fails — typically due to an electrical surge, a short circuit in the control wiring, or normal wear — the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any commands, and you may detect a faint burning odor or hear a faint buzz near the furnace cabinet.

• Specs: 120V primary | 12V & 24V secondary | 40VA rating | Factory cross-references: HT01BJ115, 19EA41612, 19EA42612
• OEM vs Generic: This is a genuine Carrier OEM part engineered to exact factory tolerances. Off-brand transformers can under-deliver VA capacity, causing repeated control board trips and premature component failure — especially in multi-stage systems.
• Install difficulty: 3/5 — Always shut off the 120V disconnect and verify zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter (to confirm secondary output at 24V after install), wire nuts or spade terminals. Photograph all wiring connections before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Direct OEM replacement for Carrier model UPFLOW200U9020AL upflow gas furnaces. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating (40VA) on the unit data plate or the old transformer label before ordering. Not sure it fits? Our parts specialists confirm fitment before you order — just reach out.