OEM Carrier 40VA Control Transformer HT01BC116 for Model PG8UAA048091AAJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8UAA048091AAJA packaged 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 safety circuits. When this part fails, the entire control circuit goes dark — the thermostat loses power, the system won't respond to any call for heat, and there are no status LED codes because the board itself has no power to operate.

• Specs: 40 VA rating | 120V primary / 24V secondary | Factory-matched OEM replacement | Part Number HT01BC116 | Designed for Carrier packaged gas units
• OEM vs Generic: OEM transformers are wound and rated to exact factory VA and insulation class specifications. Generic alternatives often use lower-grade core laminations and can run hot or fail prematurely under sustained 24V load from multiple accessories (humidifiers, zone boards, etc.).
• Install Difficulty: 2/5 — Shut off power at the disconnect and verify zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade terminals, and a multimeter to confirm 24V output after installation. Always photograph existing wiring before disconnecting leads.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for Carrier model PG8UAA048091AAJA packaged gas furnace units. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering to ensure a correct fitment. Have a question about compatibility? Our HVAC parts specialists confirm fitment before you buy — contact us before placing your order.