OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNA019000ABAA

This OEM Carrier transformer (part #HT01CN241) is the factory-specified 40VA control transformer for the Carrier PF4MNA019000ABAA fan coil and air handler units. Its job is to step down 208/230V line voltage to the 24V AC signal that powers your thermostat, control board, zone valves, and every low-voltage control circuit in the system. When the transformer fails — due to a shorted control wire, a failed board drawing excess current, or simple end-of-life — the entire control circuit goes dead: the thermostat goes blank, the system will not respond to any call for heating or cooling, and no low-voltage components will operate.

• Specs: 208/230V Primary | 24V Secondary | 40VA Rating | OEM Part #HT01CN241 | Factory-matched to Carrier PF4MNA019000ABAA specifications
• OEM vs Generic: This is a genuine Carrier OEM transformer, manufactured to exact VA capacity and insulation class. Generic transformers are often undersized in practice, running hot under full load and failing prematurely — especially in multi-zone applications drawing near the 40VA limit.
• Install Difficulty: 2/5 — Turn off power at the breaker and disconnect panel before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph or label all wiring before disconnecting terminals. Verify input voltage matches your supply (208V or 230V tap) before energizing.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Designed for the Carrier PF4MNA019000ABAA fan coil / air handler. Verify your existing transformer's primary voltage tap, secondary voltage (24V), and VA rating (40VA) against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required.