OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG8DAA024050ADJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8DAA024050ADJA gas furnace. It steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, gas valve, and all other low-voltage components. When the transformer fails, the entire control circuit goes dead — the furnace will not respond to thermostat calls, display any status codes, or attempt ignition. A failed transformer is often misdiagnosed as a bad control board, making it the first component to verify when nothing works.

• Specs: 120V primary input | 24V AC secondary output | 40VA power rating | 60 Hz | Foot-mount configuration | Wire lead connections
• OEM vs Generic: This OEM unit is wound to exact factory tolerances, ensuring stable 24V output under full load. Generic transformers can sag below 24V when the circuit is fully loaded, triggering nuisance lockouts and premature control board failures.
• Install Difficulty: 2/5 — Shut off power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wire connections before disconnecting. Note: OEM part HT01BC116 has been superseded by HT680054 — both are the same factory transformer.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PG8DAA024050ADJA gas furnace. This transformer also carries OEM cross-reference numbers HT01BC115, HT01BB126, HT01CT120, and HT01BC120. Always verify your unit's control circuit voltage requirement (24V) and VA demand on the data plate before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — order with confidence and get same-day shipping.