OEM Carrier 40VA Control Transformer 120V–24V for Model PG8UAA024065ADJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8UAA024065ADJA gas furnace. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, gas valve, and all low-voltage control circuits. When this part fails, the entire control circuit goes dark — nothing works: no heat, no fan, no thermostat response. A failed transformer is often the overlooked culprit when a furnace appears completely dead but the power supply is confirmed good. Replaces original OEM part number HT01BC116 (superseded by HT680054).

• Specs: 40VA rating | 120V primary | 24V secondary | 50/60Hz | Single-phase | Wire lead connections | Factory-matched tolerances
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board and gas valve. Undersized or off-tolerance generic units can cause erratic low-voltage behavior, nuisance lockouts, or premature control board failure.
• 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 post-install). Photograph or label all wire connections before disconnecting. The transformer mounts inside the furnace cabinet and uses wire lead connections.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8UAA024065ADJA gas furnace. This part directly supersedes OEM part number HT01BC116. Always verify your unit's data plate voltage and VA rating before ordering. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today.