OEM Carrier Furnace Transformer 120V to 24V 40VA — HT01CN001 for Model U19X080UW36A

This is the factory OEM replacement control transformer for the Carrier U19X080UW36A furnace. The transformer steps down 120V line voltage to a safe 24V (with 12V tap) for the low-voltage control circuit, powering your thermostat, control board, and all system relays. When it fails — due to a wiring short, electrical surge, or normal wear — the entire control circuit goes dark: the thermostat goes dead, the system won't respond to any commands, and no heating cycle can be initiated.

• Specs: 120V primary input | 24V / 12V secondary output | 40VA power rating | Factory-matched OEM part number HT01CN001 | Replaces legacy part numbers HT01BJ115, 19EA41612, 19EA42612
• OEM vs Generic: This is a genuine Carrier factory-authorized part, built to exact VA rating and winding tolerances. Generic transformers often run at reduced VA capacity, causing overheating, nuisance tripping of the secondary fuse, and premature control board failure.
• Install difficulty: 3/5 — Shut off all power at the breaker and disconnect the 120V supply before touching any wiring. Label all low-voltage wires before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Recommend inspecting all low-voltage wiring for shorts before energizing the new transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the exact OEM replacement for Carrier model U19X080UW36A. Verify your existing transformer's primary voltage (120V), secondary voltage (24V/12V), and VA rating (40VA) against your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists are available to verify compatibility before you buy — order with confidence and get back to comfort fast.