OEM Carrier Furnace Transformer 40VA 120V to 24V — HT01CN001 for Model UPFLOW125U60M19A

The Carrier HT01CN001 is the factory-specified OEM control transformer for the UPFLOW125U60M19A gas furnace. It steps down 120V line voltage to a safe 24V signal that powers your thermostat, control board, and all low-voltage control circuits. When this transformer fails, the entire control circuit loses power — the thermostat goes dark, the system won't respond to any commands, and you may detect a faint burning smell or audible buzz near the furnace cabinet. Replacing it with the correct OEM unit restores full system function immediately.

• Specs: 40VA capacity | 120V primary input | 12/24V dual secondary output | Factory part number HT01CN001 | Replaces legacy part numbers HT01BJ115, 19EA41612, and 19EA42612
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerance specifications. Generic aftermarket transformers often run outside the ±5% tolerance window, risking nuisance tripping of the control board's internal fuse or premature failure under high-demand heating cycles.
• Install difficulty: 2/5 — Shut off power at the breaker and verify zero voltage with a multimeter before disconnecting wires. Label or photograph all 24V secondary wiring connections. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. The transformer mounts with two screws inside the blower compartment.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Directly fits Carrier model UPFLOW125U60M19A gas furnace. Always verify your unit's data plate voltage requirements match 120V primary / 24V secondary before ordering. Need fitment confirmation? Our HVAC parts team verifies compatibility before you check out — order with confidence.