OEM Carrier Control Transformer 40VA 208/230V→24V for Model PF4MNB043T00ABAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier PF4MNB043T00ABAA air handler. The transformer steps down line voltage (208/230V primary) to the 24V AC signal that powers your thermostat, control board, and every relay in the system. When it fails, the entire control circuit goes dead — the thermostat goes blank, the system will not respond to any call for heating or cooling, and fuses may blow repeatedly if a shorted secondary winding is the root cause.

• Specs: 208/230V Primary | 24V Secondary | 40VA rated | OEM part number HT01CN241 | Factory-matched to Carrier PF4MNB043T00ABAA wiring harness and mounting footprint
• OEM vs Generic: OEM Carrier transformers are wound to exact VA and voltage tolerances. Under-rated or off-spec generic transformers overheat, trip internal thermal cutoffs prematurely, and can damage control boards through voltage sag — especially under heavy relay-switching loads.
• Install difficulty: 2/5 — Disconnect all power at the breaker and verify with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always label the 24V secondary wires before disconnecting. The swap is typically 20–30 minutes for an experienced DIYer.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered before cut-off.

Compatibility: Engineered as a direct OEM replacement for the Carrier PF4MNB043T00ABAA air handler. Verify your unit's data plate shows a 208/230V primary and 24V/40VA control circuit before ordering. Not sure it fits? Contact our parts team — we verify fitment before you buy. Order now and ship today.