OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG9MAB024040LBSA

This OEM control transformer is the factory-specified replacement for the Carrier PG9MAB024040LBSA gas furnace, cross-referencing OEM part number HT01BC116. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, gas valve, inducer relay, and all low-voltage control circuits. When it fails, the furnace goes completely silent — no thermostat response, no inducer start, no ignition attempt — because every downstream control depends on that 24V output. A failed transformer is often misdiagnosed as a bad control board, making correct identification critical before replacing more expensive components.

• Specs: 120V primary input | 24V secondary output | 40VA rating | Wire lead connection type | 60 Hz | Foot-mount configuration — factory-matched to Carrier PG9MAB024040LBSA
• OEM vs Generic: OEM transformers are wound and potted to exact VA and voltage tolerances, protecting sensitive control boards from voltage sag under load. Generic units frequently run under-rated VA, causing nuisance tripping of the integrated fuse and premature control board failure.
• Install difficulty: 2/5 — Always shut off the 120V disconnect and verify zero voltage with a multimeter before disconnecting leads. Photograph or label all wiring before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Check and replace the 3A inline fuse if blown — a shorted zone valve or thermostat wiring is often the root cause of transformer failure.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG9MAB024040LBSA gas furnace. Note: HT01BC116 has been superseded — this listing supplies the current OEM-authorized replacement meeting identical 120V/24V/40VA specifications. Always verify input voltage and VA rating on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you purchase.