OEM Carrier 40VA Control Transformer 120V–24V for Model PG9MAA024060ADKA (HT01BC116 / HT680054)

This OEM Carrier control transformer is the factory-specified replacement for the Carrier PG9MAA024060ADKA gas furnace. The transformer steps down the incoming 120V line voltage to the 24V AC signal that powers your thermostat, gas valve, inducer relay, and every other low-voltage control component in the system. When this part fails, the entire furnace goes silent — no fan, no ignition attempt, no thermostat response — because the control circuit has lost its power source. A blown fuse on the secondary side is often the first clue; if the fuse keeps blowing, the transformer itself is the likely culprit.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Foot-mount configuration | Wire-lead connections with insulated female connectors
• OEM vs Generic: This is a genuine OEM-grade Carrier replacement (current ship part HT680054, direct successor to HT01BC116). OEM units are wound to exact VA and voltage tolerances, preventing under-voltage faults that damage thermostats and control boards. Generic transformers have been documented to mount incorrectly without modification.
• Install difficulty: 2/5 — Shut off power at the breaker and confirm voltage is zero before disconnecting wires. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wire connections before removal. Label secondary leads (R and C) for correct re-termination.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — order by 3 PM local time.

Compatibility: Designed for the Carrier PG9MAA024060ADKA gas furnace. Also replaces part numbers HT01BC116, HT01BC116B, HT01BC115, HT680054, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and HT01AA012. Verify your unit's data plate shows a 120V primary / 24V secondary, 40VA control transformer before ordering. Not sure? Contact our fitment team before you buy.