OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG9MAB024060LBSA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG9MAB024060LBSA gas furnace. Its sole job is converting 120V line-voltage power down to the 24V AC signal that drives every low-voltage component in your system — the thermostat, control board, gas valve, and inducer relay. When this transformer fails, nothing responds: the thermostat goes blank, the furnace is completely unresponsive, and you may measure 0V between the R and C terminals on the control board. OEM part HT01BC116 has been superseded by HT680054, which ships in a Carrier factory-authorized parts box and is a direct plug-in replacement.

• Specs: Primary input 120V AC | Secondary output 24V AC | 40VA rated | 60 Hz | Foot-mount configuration | Wire lead connections with pre-installed female connectors
• OEM vs Generic: OEM transformers are wound and tested to Carrier's exact VA and voltage tolerances. Generic units often deliver unstable output voltage, which can damage your control board — an $150–$200 part. The OEM replacement is the safer, longer-lasting choice.
• Install difficulty: 2/5 — Shut off all power to the furnace at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Photograph or label all wiring connections before disconnecting. Verify 24V output at R–C terminals after installation. Consider adding an inline 3A fuse to protect against future low-voltage shorts.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PG9MAB024060LBSA gas furnace. OEM part number HT01BC116 has been superseded by HT680054 — both references are honored by this listing. Also cross-references HT01BC115, HT01BB126, HT01CT120, HT01BC120, and HT01AW115. Verify your unit's data plate shows a 120V primary / 24V secondary transformer before ordering. Our fitment team is available to confirm compatibility before you buy.