OEM Carrier Furnace Transformer 40VA 120V to 24V for Model UPFLOW150U4819X

This OEM Carrier furnace transformer (part #HT01CN001) is the factory-specified replacement for the Carrier UPFLOW150U4819X upflow gas furnace. The transformer steps down 120V line voltage to the 24V control-circuit voltage that powers your thermostat, gas valve, inducer relay, and all low-voltage safety controls. When this transformer fails, the entire control circuit goes dark — the furnace will not respond to the thermostat, nothing will energize, and the system will appear completely dead.

• Specs: 120V primary | 24V / 12V secondary | 40VA power rating | Also replaces legacy part numbers HT01BJ115, 19EA41612, and 19EA42612
• OEM vs Generic: OEM transformers are wound to the exact VA tolerance required by Carrier's IFC board. Undersized or off-brand units can droop under load, causing nuisance board lockouts or damaging sensitive low-voltage components.
• Install difficulty: 2/5 — Turn off all power at the breaker and disconnect the furnace service switch before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching wires). Photograph all wire connections before removal. The transformer typically mounts to the vestibule panel with two screws and uses spade or screw-terminal connections.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as a direct OEM replacement for Carrier model UPFLOW150U4819X. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating on the data plate before ordering to confirm fitment. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy — reach out via chat or phone.