OEM Carrier Transformer for UPFLOW100UA14A

The control transformer in your Carrier UPFLOW100UA14A furnace steps the incoming 120V (or 240V) line voltage down to the 24V low-voltage power that runs your thermostat, gas valve, control board, and relays. It is the heart of the control circuit — without it, nothing in the system can call for heat or cool. When a transformer fails or shorts, homeowners typically notice a completely dead thermostat, a furnace that won't respond to any setting, a blown low-voltage fuse on the board, or a faint humming followed by silence. Intermittent failures show up as a system that works until the unit heats up, then drops out. This is a Class II 40VA control transformer with a 120/240V primary and a 24V secondary, matched to Carrier's OEM VA rating and winding insulation class. The 40VA capacity is sized to carry the gas valve, inducer relay, and board load simultaneously without sagging — an undersized replacement browns out the control voltage under load. Why OEM matters here: generic transformers are often wound to looser VA tolerances and use thinner-gauge magnet wire that runs hotter and sags voltage when the gas valve energizes, causing erratic control behavior and shortened life. The OEM unit holds 24V steady across the full load and uses the correct mounting footprint and lead colors. Install difficulty: 2/5. Tools: 1/4" nut driver, multimeter, wire strippers. #1 safety warning: KILL THE BREAKER to the furnace before touching the primary leads — the line side carries lethal 120/240V even with the thermostat off. Verify secondary output reads 24-28V before reconnecting. Ships same business day from our stocked warehouse on orders placed before 3 PM CST. Backed by a 1-year OEM warranty and 30-day hassle-free returns on uninstalled parts.

Compatibility

This part is compatible with Carrier model UPFLOW100UA14A. 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.