OEM Carrier 40VA Control Transformer 230/115V for Model 09DE054510

This OEM control transformer (part# HT01BC208) is the factory-specified replacement for the Carrier 09DE054510 HVAC system. The transformer steps down line voltage (230V or 115V primary) to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to calls for heating or cooling, and no safety safeties can operate. It is often the first part to check when absolutely nothing works.

• Specs: 40VA output | 230V / 115V dual-tap primary | 24V AC secondary | 60 Hz | Factory OEM tolerance — matches original wire terminals and mounting footprint exactly
• OEM vs Generic: OEM transformers are wound to Carrier's exact VA rating and insulation class. Undersized or off-brand units can overheat, trip thermal cutouts repeatedly, or fail prematurely — leaving you with the same no-power symptom within one season.
• Install difficulty: 2/5 — Shut off power at the breaker and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wire connections before disconnecting. Confirm primary tap (115V or 230V) matches your supply voltage before reinstalling.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for Carrier model 09DE054510. Cross-references include OEM part numbers 320659-301 and 2-05757-1. Always verify primary voltage tap requirements on your unit's data plate before ordering. Not sure it fits? Contact our parts team — we confirm fitment before you buy.