OEM Carrier Furnace Control Transformer 40VA 120V/24V for Model PG8MAA036070ADJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8MAA036070ADJA gas furnace, replacing original part number HT01BC116 (superseded by HT680054). The transformer steps down 120V line voltage to the 24V AC signal used by the furnace control board, thermostat, gas valve, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the furnace won't respond to any call for heat, and no error codes will display because the board itself has no power.

• Specs: 40VA rating | 120V primary | 24V secondary | 50/60 Hz single-phase | Compact 3"L × 2-3/16"W × 2"H form factor | Wire lead connections
• OEM vs Generic: This OEM unit is wound to factory-exact VA and voltage tolerances. Undersized or off-tolerance generic transformers can overheat under full control-circuit load, trip thermal protection prematurely, and shorten board life.
• Install Difficulty: 2/5 — Turn off power at the breaker and confirm 0V with a meter before touching any wiring. Photograph all wire connections before removal. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Label leads before disconnecting the old unit.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse when ordered by 5 PM local time.

Compatibility: Designed for Carrier model PG8MAA036070ADJA gas furnaces. This transformer supersedes legacy OEM part HT01BC116 and is also cross-referenced to HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, HT01AA012, and HT01AQ110 — making it a broad-coverage solution for Carrier, Bryant, and Payne furnace platforms. Verify your unit's data plate voltage before ordering. Our team is available to confirm fitment prior to purchase.