OEM Carrier Furnace Control Transformer 40VA 120V/24V for Model PG8DAA060135ADJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8DAA060135ADJA gas furnace. It converts 120V line voltage to the 24V AC signal that powers every low-voltage component in the system — the thermostat, gas valve, inducer relay, and control board. When this transformer fails, the furnace goes completely dark: the thermostat loses signal, the board stops responding, and the heating cycle never initiates. If your furnace shows no response to a thermostat call and 24V is absent between the R and C terminals on the board, this transformer is the most likely culprit.

• Specs: 40VA capacity | 120V primary input | 24V secondary output | 60 Hz | Single phase | Wire lead connection type | Compact foot-mount design (approx. 3″ L × 2.1″ W × 2″ H)
• OEM vs Generic: This is a genuine OEM Carrier transformer shipped in a factory-authorized parts box. Generic transformers frequently run outside VA tolerance, causing nuisance board shutdowns, intermittent thermostat dropouts, and premature low-voltage component failure.
• Install difficulty: 2/5 — Power down and lock out the furnace at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching wires). Photograph all wiring connections before disconnecting. The transformer mounts to the blower deck or control panel with two screws; wire leads connect to push-on terminals.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Direct OEM replacement for Carrier model PG8DAA060135ADJA gas furnace. Part number HT01BC116 has been factory-superseded by updated OEM part HT680054 — our listing ships the current production unit, which is a direct drop-in with no modification required. Also cross-references to HT01BC115, HT01BB126, HT01CT120, HT01BC120, and several other legacy Carrier/Bryant/Payne transformer part numbers. Verify your unit's control board calls for a 40VA 120V/24V transformer before ordering.