OEM Carrier Control Transformer 40VA 230V/115V for Model 09DE064C900

This OEM control transformer is the factory-specified replacement for the Carrier 09DE064C900. The transformer steps down line voltage to power the low-voltage control circuit that runs your thermostat, contactor coil, and safety switch logic. When this transformer fails, the entire control circuit loses power — nothing responds, the thermostat goes blank, and the system won't start. If you're seeing a completely unresponsive unit with no 24V signal at the board, a failed transformer is one of the first components to test.

• Specs: 40VA rating | 230V primary voltage | 115V secondary voltage | OEM Part # HT01BC208 | Cross-references: 320659-301, 2-05757-1
• OEM vs Generic: This is a genuine Totaline/Carrier OEM transformer wound to exact factory VA and voltage specifications. Generic transformers often run outside rated tolerances, risking control board damage or nuisance tripping of the internal fuse.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all wires before disconnecting. Confirm secondary output voltage with a multimeter before restoring power.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model 09DE064C900. Verify primary and secondary voltages against your unit's data plate before ordering. Cross-reference numbers 320659-301 and 2-05757-1 can be used to confirm fitment. Need help verifying the correct part? Our HVAC parts specialists confirm compatibility before you order — reach out today and get your system back online fast.