OEM Carrier Transformer 40VA 120V to 24V for Model FF1DNA024075ABAA

This is the factory OEM replacement transformer (part number HT01CN236) for the Carrier FF1DNA024075ABAA air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dead — your thermostat display goes blank, the system won't respond to any calls for heating or cooling, and no safety controls can operate. A failed transformer is often mistaken for a bad control board, so always test this component first before replacing more expensive parts.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched output tolerance for stable low-voltage operation
• OEM vs Generic: OEM transformers maintain precise 24V output under load, protecting sensitive control boards and thermostats. Off-brand units can deliver unstable voltage that damages downstream components or causes nuisance lockouts.
• Install Difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify output voltage with a multimeter after installation before restoring full power. Always photograph existing wiring before disconnecting.
• Warranty: 1-year OEM factory warranty. Orders placed by 3PM ship same business day from our HVAC parts warehouse.

Compatibility: Engineered specifically for the Carrier FF1DNA024075ABAA air handler. Verify your existing transformer's VA rating and primary/secondary voltage on the unit's data plate before ordering to confirm fitment. Our parts specialists are available to confirm compatibility before you buy — no guesswork required. In stock and ready to ship today.