OEM Carrier 40VA Control Transformer 120V to 24V — HT01CN001 for Model UPFLOW125U60M19

This is the genuine OEM Carrier replacement control transformer (part #HT01CN001) factory-specified for the Carrier UPFLOW125U60M19 upflow gas furnace. The transformer steps down 120V line voltage to a safe 24V (with 12V tap) to power your furnace's entire low-voltage control circuit — including the thermostat, control board, gas valve, and all safety switches. When it fails, the entire system goes dark: the thermostat loses power, the furnace will not respond to any call for heat, and you may notice a faint buzzing or burning smell near the control box.

• Specs: 120V Primary | 24V / 12V Secondary | 40VA Rating | Factory-matched Carrier OEM unit | Class 2 control transformer
• OEM vs Generic: The OEM HT01CN001 is wound to exact factory tolerances, ensuring stable 24V output under full load. Generic substitutes can sag under load, causing intermittent control board resets, nuisance lockouts, and premature board failure — costing far more to diagnose and repair than the transformer itself.
• Install difficulty: 3/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, a multimeter (to verify 24V output post-install), and wire labels. Photograph all wiring connections before disconnecting. The transformer mounts inside the furnace cabinet with two screws and uses push-on or screw terminals on both primary and secondary sides.
• Warranty: 1-year OEM Carrier factory warranty. In-stock and ships same business day from our warehouse — no extended lead times.

Compatibility: Direct OEM replacement for Carrier model UPFLOW125U60M19 upflow gas furnace. Replaces legacy part numbers HT01BJ115 and 19EA41612. Always confirm 120V primary / 24V secondary / 40VA on your unit's data plate before ordering. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy — contact us today and get back up and running fast.