OEM Carrier Furnace Transformer 120V to 24V 40VA — HT01CN001 for UPFLOW100UAHAC14B

This OEM furnace control transformer (part number HT01CN001) is the factory-specified replacement for the Carrier UPFLOW100UAHAC14B upflow gas furnace. The transformer steps down 120V line voltage to a 24V control circuit, powering the thermostat, gas valve, inducer relay, and all low-voltage safety controls. When it fails, the entire control circuit goes dead — the furnace will not respond to the thermostat, no components will energize, and you may measure 0V at the 24V secondary terminals with a multimeter.

• Specs: 120V primary | 24V / 12V secondary | 40VA power rating | Replaces legacy part numbers HT01BJ115, 19EA41612, and 19EA42612 | Direct plug-in OEM fitment
• OEM vs Generic: This is the factory-matched OEM unit built to Carrier's exact VA rating and secondary voltage tolerance. Generic transformers rated slightly under 40VA can cause nuisance brownouts under full control-circuit load, leading to intermittent lockouts.
• Install difficulty: 2/5 — Turn off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring before disconnecting. Confirm 24V output with a meter after installation before closing the cabinet.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse on all in-stock orders.

Compatibility: Engineered for the Carrier UPFLOW100UAHAC14B upflow gas furnace. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating (40VA) on the data plate or old unit label before ordering. Questions? Our HVAC parts specialists verify fitment before you buy — no guesswork required.