OEM Carrier Transformer for UPFLOW100HCU12B

This control transformer powers the entire 24V low-voltage circuit in your Carrier UPFLOW100HCU12B furnace. It converts incoming line voltage into the 24V that energizes your thermostat, control board, inducer relay, and gas valve. If the transformer opens up or shorts internally, the symptoms are unmistakable: a blank thermostat, a furnace that ignores every heat or cool call, or a repeatedly blown 3-amp low-voltage fuse on the control board. A transformer that's failing under thermal stress will let the system start, then cut out once the cabinet warms — a frustrating intermittent no-heat condition. Specs: Class II 40VA control transformer, 120/240V dual primary, 24V secondary, matched to Carrier's OEM insulation class and VA rating. The 40VA rating provides headroom so the secondary voltage holds steady when the gas valve and inducer pull current at the same time. Why OEM matters: aftermarket transformers frequently use lighter magnet wire and looser winding tolerances, so they sag below 24V under load and run hot, which cooks the insulation and shortens service life. The OEM transformer maintains stable control voltage and bolts in with the correct footprint and lead identification. Install difficulty: 2/5. Tools needed: 1/4" nut driver, multimeter, wire strippers. #1 safety warning: TURN OFF THE BREAKER feeding the furnace before you touch the primary leads — the 120/240V line side is lethal regardless of thermostat position. Confirm 24-28V on the secondary before buttoning up the panel. Ships same business day from our stocked warehouse on orders before 3 PM CST. Covered by a 1-year OEM warranty with 30-day hassle-free returns on uninstalled parts.

Compatibility

This part is compatible with Carrier model UPFLOW100HCU12B. Always verify the part number against your unit's data plate before ordering.

Why Choose OEM?

OEM parts are manufactured to the exact factory specifications for your unit. Generic aftermarket alternatives may fit physically but often use lower-rated components that reduce equipment life and void manufacturer warranties. When the cost difference between OEM and generic is $10-30, the OEM part is always the smarter investment on a system worth $5,000-$15,000.

Shipping & Returns

Same-day shipping on orders before 3 PM CST. Standard delivery 2-5 business days, express options available at checkout. 30-day hassle-free returns on uninstalled parts — free return shipping included. 1-year OEM factory warranty coverage.