OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG9MAA024060AFKA

This OEM step-down transformer (part # HT01BC116 / superseded by HT680054) is the factory-specified control circuit transformer for the Carrier PG9MAA024060AFKA gas furnace. Its job is to convert 120V line voltage down to the 24V AC signal that powers your thermostat, gas valve, inducer relay, and control board logic. When this transformer fails — whether from a shorted secondary, a blown internal fuse, or heat-related winding failure — the entire low-voltage control circuit goes dead: the furnace will not respond to the thermostat, will not attempt ignition, and may show no LED activity on the control board whatsoever.

• Specs: Primary input 120V AC | Secondary output 24V AC | VA rating: 40VA | Frequency: 60Hz | Mounting: Foot-mount | Connection: Wire leads with insulated female connectors | Includes 3A inline fuse
• OEM vs Generic: OEM transformers are wound to exact VA tolerance, ensuring stable 24V output under full control-circuit load. Generic units often under-deliver VA capacity, causing erratic relay chatter, nuisance lockouts, and premature contactor wear.
• Install difficulty: 2/5 — Shut off furnace power at the disconnect before starting. Photograph or label all wiring connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always verify 0V at transformer terminals before touching wires.
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG9MAA024060AFKA gas furnace. Note: OEM part HT01BC116 has been superseded by Carrier part # HT680054 — this listing ships the current OEM equivalent. Verify your unit's data plate shows a 120V primary / 24V secondary / 40VA transformer before ordering. Our fitment team is available to confirm compatibility before you buy.