OEM Carrier 40VA Furnace Control Transformer 120V–24V for Model PG9MAA060140ADKA

This OEM Carrier step-down transformer is the factory-specified replacement for the Carrier PG9MAA060140ADKA gas furnace. The transformer converts 120V line voltage to the 24V AC low-voltage signal that powers your thermostat, gas valve, inducer relay, and control board. When the transformer fails, the entire low-voltage control circuit goes dead — you'll see no thermostat response, no inducer startup, and no heat output whatsoever. This is one of the most commonly overlooked components during a no-heat diagnostic.

• Specs: 40VA rating | 120V primary / 24V secondary | 50/60 Hz | Single phase | Wire lead connections | Compact 3" L × 2-2/16" W × 2" H footprint
• OEM vs Generic: This OEM transformer ships in a Carrier factory-authorized parts box and meets exact VA and voltage output tolerances. Generic transformers can output slightly off-spec 24V, stressing control boards and gas valves. OEM is always the safer choice for furnace control circuits.
• Install difficulty: 2/5 — Turn off power at the disconnect before starting. Tools needed: flathead screwdriver, needle-nose pliers, multimeter. Label all wire leads before disconnecting. Check voltage between C and R terminals on the control board after installation to confirm 24V output.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship the same business day from our warehouse.

Compatibility & Cross-Reference: Fits Carrier model PG9MAA060140ADKA and is the current OEM successor (HT680054) to legacy part number HT01BC116. Also cross-references HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, HT01AA012, and 322666-701. Verify your unit's data plate voltage rating before ordering. Have a question? Our HVAC parts team confirms fitment before you buy — call or chat now.