OEM Carrier 40VA 120V-24V Furnace Transformer for Model PG9MAB060080LBSA (Part# HT01BC116 / HT680054)

This is the OEM factory-specified step-down transformer for the Carrier PG9MAB060080LBSA gas furnace. The transformer converts 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, control board signals, gas valve coil, and zone controls. When this transformer fails, the entire low-voltage system loses power: the thermostat goes blank, the furnace won't respond to any call for heat, and in some cases the control board may indicate a fault. A blown 3A fuse on the secondary side is often the first sign of transformer stress.

• Specs: 40VA rating | 120V primary / 24V secondary | 50/60 Hz | Single phase | Foot-mount with wire lead connections | Compact 3″ L × 2-3/16″ W × 2″ H housing
• OEM vs Generic: This OEM unit ships in a Carrier/Bryant factory-authorized parts box and is wound to exact VA and voltage tolerances. Generic transformers often run under-spec VA ratings, causing premature thermal cutout or insufficient voltage under load — especially on multi-zone systems where secondary current draw is higher.
• Install difficulty: 2/5 — Turn off 120V power at the breaker and disconnect the furnace before beginning. Label or photograph all wire connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 24V output after install). Check and replace the inline 3A secondary fuse if blown — a blown fuse may indicate a short elsewhere in the low-voltage circuit.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered by 5PM local time.

Compatibility & Part Number Note: Original part number HT01BC116 has been superseded by HT680054 — the current OEM replacement shipped in all new orders. Also replaces: HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, HT01AA012, HT01AQ110, HT01CT210, 322666-701, B1810113, and more. Fits Carrier PG9MAB060080LBSA and a wide range of Carrier, Bryant, and Payne furnaces with 40VA 120V/24V transformer requirements. Verify specs on your unit's data plate before ordering. In stock and ready to ship — order now!