OEM Carrier Control Transformer 40VA 208/230V–24V for Model PF4MNA019T00ABAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier PF4MNA019T00ABAA fan coil and air handler unit. The transformer steps down 208/230V line voltage to the 24V AC signal that powers your thermostat, control board, relays, and zone controllers. When this transformer fails, the entire control circuit goes dead — your thermostat loses power, the system won't respond to calls for heating or cooling, and no diagnostic codes are generated because the board itself has no power. A failed transformer is a common misdiagnosis situation: always test transformer output voltage before condemning a control board.

• Specs: 208/230V Primary | 24V Secondary | 40VA Rating | Direct OEM drop-in replacement | Factory-matched impedance and thermal protection
• OEM vs Generic: The OEM HT01CN241 is manufactured to Carrier's exact VA and impedance specifications, ensuring the control board and thermostat receive stable, clean 24V. Generic transformers may run hot, output off-voltage under load, or lack internal thermal fuses — risking damage to downstream boards and controls.
• 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 verify 24V output after install). Label or photograph all wiring before disconnecting. Most installations take 20–30 minutes.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PF4MNA019T00ABAA fan coil/air handler. Always verify your unit's data plate voltage matches 208/230V primary before ordering. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions. In stock and ready to ship today.