OEM Carrier Furnace Transformer 120V to 24V 40VA — HT01CN001 for Model UPFLOW100U48M19A

This is the factory-specified OEM control transformer for the Carrier UPFLOW100U48M19A upflow gas furnace. The transformer steps down 120V line voltage to a safe 24V (with 12V tap) to power the entire low-voltage control circuit — including the thermostat, ignition board, gas valve, and zone controls. When this transformer fails, the result is total control loss: a blank thermostat display, an unresponsive furnace, or a tripped internal fuse with no obvious cause. Electrical surges, short circuits in the control wiring, and normal wear are the most common causes of failure.

• Specs: 120V Primary | 24V / 12V Secondary | 40VA Rating | Factory OEM — Part # HT01CN001 | Replaces legacy part numbers HT01BJ115, 19EA41612, 19EA42612
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, manufactured to exact VA and voltage tolerances. Generic transformers may run outside spec, risking nuisance tripped fuses, under-voltage to the control board, or premature failure — all of which complicate diagnostics and extend downtime.
• Install difficulty: 3/5 — Shut off power at the breaker and confirm zero voltage before proceeding. Tools needed: multimeter (verify secondary output is 24–26V after install), flat-head and Phillips screwdrivers, needle-nose pliers, wire nuts or spade connectors. Always check low-voltage wiring for shorts before installing the new transformer — an unresolved short will blow the new unit immediately.
• Warranty: 1-year OEM Carrier factory warranty. In-stock orders ship same business day from our warehouse. Free shipping on qualifying orders.

Compatibility: Designed for the Carrier UPFLOW100U48M19A upflow gas furnace. Verify your existing transformer's primary/secondary voltage and VA rating against your unit data plate before ordering. Our parts specialists are available to confirm fitment — reach out before you buy for peace of mind.