OEM Carrier 120V–24V 40VA Control Transformer HT01BC116 for Model PG8MAA036070ACJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8MAA036070ACJA gas furnace. The transformer converts 120V line voltage down to 24V AC to power all low-voltage control circuit components — including the thermostat, gas valve, inducer relay, and control board. When this part fails, the furnace loses its entire control circuit: the thermostat goes blank, no call for heat is received, and nothing starts. It's often misdiagnosed as a thermostat or board failure, so always check 24V output at the R–C terminals before replacing costlier components.

• Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | Connection: Wire Leads with pre-installed connectors | Mounting: Foot mount | Includes 3A fuse protection
• OEM vs Generic: This is a genuine Carrier OEM transformer built to exact factory VA and voltage tolerances. Generic transformers often run outside rated output voltage, which can cause nuisance lockouts, premature control board failure, or erratic thermostat behavior. OEM is always the safer choice for the control circuit.
• Install Difficulty: 2/5 — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output post-install). Photograph all wire connections before disconnecting. Swap wire leads one at a time to avoid miswiring.
• Warranty & Shipping: 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse.

Compatibility Note: Fits Carrier model PG8MAA036070ACJA gas furnace. This part supersedes OEM part number HT01BC116; the current shipping part number is HT680054. Also cross-references HT01BC115, HT01BB126, HT01BC120, and B1810113. Verify your unit's data plate voltage (120V primary) before ordering. Our fitment team is available to confirm compatibility before you buy.