OEM Carrier 40VA Control Transformer HT01CN241 for Model PF4MNB019T00AAAA

This OEM Carrier transformer (part number HT01CN241) is the factory-specified replacement for the Carrier PF4MNB019T00AAAA fan coil / air handler unit. The transformer steps down line voltage from 208/230V primary to a safe 24V secondary signal used by the thermostat, control board, and all low-voltage control circuits. When this transformer fails, the entire control circuit goes dead — your thermostat will appear unresponsive, and the system will not heat or cool at all. It is often the first component to diagnose when a system produces zero response despite correct thermostat settings.

• Specs: 208/230V Primary | 24V Secondary | 40VA power rating | Direct OEM drop-in replacement for Carrier PF4MNB019T00AAAA
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, built to exact OEM voltage and VA tolerances. Generic transformers may be under-rated for VA load, causing premature burnout or nuisance tripping of the internal thermal fuse — a common callback failure point.
• Install Difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring before disconnecting. The transformer typically mounts to the blower compartment panel with two screws and uses spade or screw-terminal connections.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for Carrier model PF4MNB019T00AAAA. Always verify your unit's data plate voltage and VA requirements before ordering. Not sure it fits? Our HVAC parts specialists are available to confirm fitment before you order — contact us today and get your system back online fast.