OEM Carrier Furnace Transformer 120V to 24V 40VA — HT01CN001 for Model UPFLOW125UAAC14B

This is the factory OEM replacement transformer (part# HT01CN001) for the Carrier UPFLOW125UAAC14B upflow gas furnace. The transformer steps down 120V line voltage to a 24V/12V secondary signal that powers the entire low-voltage control circuit — including the thermostat, control board, gas valve, and safety switches. When this transformer fails, the system loses all control-circuit power: the thermostat goes blank, the furnace won't respond to any call for heat or cooling, and in many cases nothing happens at all when the system is commanded to run. A failed transformer is often misdiagnosed as a thermostat or control board issue, making correct identification of this part critical before replacing more expensive components.

• Specs: 120V primary | 24V / 12V secondary | 40VA rating | Factory-matched OEM tolerances | Replaces legacy part numbers HT01BJ115, 19EA41612, 19EA42612
• OEM vs Generic: The OEM HT01CN001 is wound to exact Carrier factory specifications, ensuring precise 24V output under full control-circuit load. Generic transformers with loose VA tolerances can sag under load, causing erratic board behavior, nuisance lockouts, or premature secondary-component failure.
• Install difficulty: 2/5 — Shut off all power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm 0V at primary terminals before handling. Label all low-voltage wiring before disconnecting from the old transformer. Verify output reads ~24V AC after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as the direct OEM drop-in replacement for the Carrier UPFLOW125UAAC14B upflow gas furnace. Always verify your unit's data plate and existing transformer VA rating before ordering to ensure a correct fit. Have your model and serial number ready — our team is available to confirm fitment before you purchase. Order now and receive same-day shipping on in-stock units.