OEM Carrier Transformer 40VA 120V/24V for Model PG8MAA048135AAJA

This OEM replacement transformer (part number HT01BC116) is the factory-specified control circuit transformer for the Carrier PG8MAA048135AAJA gas furnace. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching logic. When this part fails, the entire control circuit goes dark — symptoms include a completely blank thermostat display, no response to heat or cool calls, and no furnace activity whatsoever even with line voltage present at the unit.

• Specs: 40VA rated | Primary: 120VAC | Secondary: 24VAC | Factory-matched OEM construction | Encapsulated windings for moisture resistance
• OEM vs Generic: The OEM HT01BC116 is wound and tested to Carrier's exact VA rating and insulation class. Undersized or off-tolerance generic transformers can overheat under full 24V load, blow internal fuses, and damage the control board — making OEM the only reliable long-term choice.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, needle-nose pliers, multimeter to confirm 24V output post-install. Photograph all wire connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier PG8MAA048135AAJA packaged gas furnace. Always verify secondary voltage (24V) and VA rating on your unit's data plate or existing transformer label before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions.