OEM Carrier Furnace Control Transformer 120V-24V 40VA for Model PG8JAA048090AAJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8JAA048090AAJA gas furnace. It converts 120V line voltage to 24V AC, powering every low-voltage component in the system — the thermostat, gas valve, inducer relay, control board, and ignition sequence. When the transformer fails, the furnace goes completely silent: the thermostat goes blank, the board shows no activity, and no ignition attempt is made. A failed transformer is often misdiagnosed as a bad control board, making correct identification critical before replacing costlier components.

• Specs: Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 50/60 Hz | Phase: Single | Mounting: Foot mount | Connection: Wire leads with insulated female quick-connect terminals
• OEM vs Generic: This OEM unit is factory-matched to Carrier's exact 40VA output tolerance. Generic transformers frequently deliver unstable secondary voltage, causing intermittent board lockouts, nuisance thermostat dropouts, and premature gas valve wear. The OEM part ships in a Carrier factory-authorized parts box.
• Install difficulty: 2/5 — Always shut off 120V power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (confirm 0V at primary leads before touching wiring). Photograph all wire connections before disconnecting. The transformer mounts via foot bracket and connects with color-coded wire leads — a straightforward swap for any technician or confident DIYer.
• Warranty & Shipping: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PG8JAA048090AAJA gas furnace. OEM part number HT01BC116, superseded by HT680054 — both are fully interchangeable. Also fits a wide range of Carrier, Bryant, and Payne furnaces using the 120V-24V 40VA transformer specification. Verify primary/secondary voltage and VA rating on your unit's data plate before ordering. Our parts specialists are available to confirm fitment — order today and get your furnace back online fast.