OEM Carrier 40VA Control Transformer HT01BC116 for Model PG9MAA060120AEKA

This OEM control transformer (part number HT01BC116) is the factory-specified replacement for the Carrier PG9MAA060120AEKA gas furnace. The transformer steps down 120V line voltage to the 24V AC signal that powers the control board, thermostat circuit, and all low-voltage switching in the furnace. When this component fails, the entire control circuit goes dark — you'll see a blank thermostat, no response to a heat call, and no error codes displayed on the board because the board itself has lost power. Replacing this part is often the fastest and most affordable fix before condemning an expensive control board.

• Specs: 40 VA rated | 120V primary → 24V secondary | OEM-matched impedance and thermal protection | Designed for continuous duty in enclosed furnace applications
• OEM vs Generic: OEM transformers from Carrier meet exact VA and impedance ratings required by the PG9MAA060120AEKA control board. Undersized or off-tolerance generic transformers can sag under load, causing intermittent lockouts, nuisance tripping of the board's fuse, or premature control board failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output post-install). Always discharge any capacitors and photograph wiring connections before removing the old transformer.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Factory-matched for Carrier model PG9MAA060120AEKA 80% AFUE gas furnace. Cross-reference your unit's data plate and confirm 120V/24V/40VA ratings before ordering. Our parts specialists are available to verify fitment — contact us before you buy if you have any questions. Order today and your part ships the same business day.