OEM Carrier Control Transformer 40VA 120V–24V for Model UPFLOW080U3619A

This OEM replacement transformer (Part# HT01CN001) is the factory-specified control transformer for the Carrier UPFLOW080U3619A upflow gas furnace. Its job is to step down line voltage (120V) to the 24V signal voltage that powers your thermostat, control board, gas valve, and every low-voltage safety circuit in the system. When the transformer fails, the entire control circuit goes dark — the thermostat shows no power, the furnace won't respond to any call for heat or cooling, and nothing happens when you check the stat. Before replacing the control board, always test the transformer first; it's a far more common — and far less expensive — cause of total system lockout.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Replaces OEM Part# HT01CN001 | Factory-matched electrical tolerances
• OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact VA and voltage specifications. Generic transformers are frequently under-rated in VA, causing overheating, nuisance tripping of the built-in thermal fuse, and premature failure under normal system load.
• Install Difficulty: 2/5 — Shut off the disconnect and verify 0V with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wire connections before disconnecting. Reconnect primary (line voltage) wires last.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before 3 PM ship same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier UPFLOW080U3619A upflow gas furnace. Always verify your unit's data plate voltage requirements match this transformer's 120V primary / 24V secondary before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment — contact us before you order.