OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG9MAA060100ABKA (Replaces HT01BC116)

This OEM step-down transformer is the factory-authorized replacement for the Carrier PG9MAA060100ABKA gas furnace, superseding original part number HT01BC116 with updated part HT680054. The control transformer is the backbone of your furnace's low-voltage circuit — it converts 120V line power down to 24V AC to energize the thermostat, control board, gas valve, and all safety circuits. When this transformer fails, absolutely nothing responds: the thermostat goes blank, the furnace won't fire, and you may measure zero voltage at the R and C terminals on the control board. Replace it first before condemning more expensive components.

• Specs: 120V primary | 24V secondary | 40VA rating | 50/60 Hz | Single-phase | Wire-lead connections | Foot-mount configuration | Compact 3″ L × 2-3/16″ W × 2″ H
• OEM vs Generic: This OEM unit is wound to exact Carrier factory tolerances, ensuring stable 24V output under full load. Generic transformers often sag under load, causing intermittent lockouts, nuisance fuse trips, and premature control board failure — a far more expensive repair.
• Install difficulty: 2/5 — Shut off power at the breaker and confirm zero voltage before disconnecting leads. Photograph all wiring connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output post-install. Check between C (Common) and R (Red) terminals on the control board to confirm correct output.
• Warranty & Shipping: 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse. Replaces HT01BC116, HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and other legacy part numbers.

Compatibility: Engineered for the Carrier PG9MAA060100ABKA gas furnace and compatible Carrier, Bryant, and Payne models specifying a 120V–24V 40VA control transformer. Verify your unit's data plate voltage and VA ratings before ordering. Not sure it fits? Our parts team confirms fitment before you buy — reach out before placing your order.