OEM Carrier Furnace Transformer 40VA 120V to 24V for Model UPFLOW070US12B

The Carrier HT01CN001 is the factory-specified OEM control transformer for the Carrier UPFLOW070US12B upflow gas furnace. This transformer steps down 120V line voltage to a 12/24V low-voltage output at 40VA, powering the furnace's entire control circuit — including the thermostat, control board, ignition sequence, and safety safeties. When this transformer fails, the furnace loses its low-voltage control circuit entirely: the thermostat goes dark, the system will not respond to any call for heat or cooling, and in some cases you may detect buzzing, burning smell, or a tripped inline fuse. Replacing it with the correct OEM unit restores the factory-spec voltage and ensures all downstream controls operate within design parameters.

• Specs: 120V primary | 12V & 24V secondary outputs | 40VA rated | Factory-matched OEM tolerances | Part No. HT01CN001 (supersedes HT01BJ115, 19EA41612, 19EA42612)
• OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA and voltage tolerances. Undersized or off-tolerance aftermarket units can over-stress the secondary circuit, cause nuisance fuse trips, and void equipment warranties.
• Install Difficulty: 3/5 — Requires shutting off power at the disconnect AND the breaker before accessing the transformer. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output post-install). Photograph all low-voltage wiring connections before removal. The inline fuse on the 24V circuit should be inspected and replaced if blown — a failed fuse is often the root-cause symptom.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse on orders placed before cutoff.

Compatibility: Engineered as a direct OEM drop-in replacement for the Carrier UPFLOW070US12B upflow gas furnace. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating (40VA) on the data plate before ordering. If your furnace's inline fuse is blown, inspect all low-voltage wiring for shorts before installing the new transformer to prevent immediate failure. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — no guesswork.