OEM Carrier Furnace Transformer 40VA 120V to 24V — Model UPFLOW080US12B (HT01CN001)

This OEM Carrier transformer (part #HT01CN001) is the factory-specified control circuit transformer for the Carrier UPFLOW080US12B upflow gas furnace. Its job is to step down 120V line voltage to the 24V low-voltage signal that powers your thermostat, control board, gas valve, and every other safety and sequencing component in the system. When this transformer fails, the result is total loss of control power — the thermostat goes blank, the furnace will not respond to a call for heat, and the system appears completely dead even though line voltage is present at the unit.

• Specs: 120V primary | 24V / 12V secondary | 40VA rated | Factory OEM part #HT01CN001 | Replaces superseded part numbers HT01BJ115, 19EA41612, and 19EA42612
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board and safety circuits. Undersized or off-tolerance aftermarket units can cause nuisance lockouts, erratic board behavior, or premature failure of downstream controls.
• Install difficulty: 2/5 — Disconnect power at the breaker and confirm voltage is absent before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring connections before removal. Swap the transformer, reconnect, restore power, and verify 24V output with a multimeter before closing the cabinet.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Factory-matched for the Carrier UPFLOW080US12B upflow gas furnace. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering — do not substitute a lower-VA unit. Questions about fitment? Our HVAC parts specialists verify compatibility before you order. Order now and this part ships today.