OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG8DAA036050ADJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8DAA036050ADJA gas furnace. The transformer steps down 120V line voltage to the 24V signal voltage that powers the thermostat circuit, control board, gas valve, and every low-voltage component in your system. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the furnace won't respond to any call for heat, and no fault codes are displayed. Replacing this part is typically the fastest path to restoring full system operation.

• Specs: Primary 120 VAC | Secondary 24 VAC | 40VA rating | 50/60 Hz | Single-phase | Wire-lead connections | Replaces OEM part # HT01BC116 (superseded by HT680054)
• OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact factory VA tolerances. Generic aftermarket transformers often deliver inconsistent secondary voltage, causing erratic board behavior, nuisance lockouts, and premature control board failure — saving $5 upfront can cost $150 later.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching wires). Photograph all wire connections before removing the old transformer. Most techs complete this swap in under 20 minutes.
• Warranty: 1-year OEM manufacturer warranty. Orders ship same business day from our warehouse when placed before the cutoff.

Compatibility: Engineered for the Carrier PG8DAA036050ADJA gas furnace and cross-references to multiple Carrier, Bryant, and Payne models using the same 40VA 120V–24V transformer specification. Verify your existing transformer's primary voltage, secondary voltage, and VA rating on the data label before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required. Order now and get it shipped today.