OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF1MNB030000AAAA

This OEM Carrier transformer (part number HT01CN241) is the factory-specified 24V control circuit transformer for the Carrier PF1MNB030000AAAA fan coil and air handler system. The transformer steps down 208/230V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control circuitry. When this part fails, the entire control circuit goes dark — the thermostat goes blank, the system stops responding to calls for heating or cooling, and no fault codes are displayed because the board itself has lost power. A failed transformer is often misdiagnosed as a thermostat or control board problem, so always confirm 24V output at the secondary terminals before replacing more expensive components.

• Specs: 208/230V Primary | 24V Secondary | 40VA rating | Factory-matched Carrier OEM specification | Part No. HT01CN241
• OEM vs Generic: OEM transformers are wound and tested to exact Carrier factory tolerances, ensuring a clean, stable 24V output under full VA load. Generic units may sag under load, causing intermittent control board lockouts or nuisance thermostat resets.
• Install Difficulty: 2/5 — Shut off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter. Verify 0V at primary terminals before handling. Photograph existing wire connections, then match wires to the new transformer's terminals. Restore power and confirm 24V AC at secondary terminals before buttoning up the panel.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as a direct OEM replacement for the Carrier PF1MNB030000AAAA fan coil/air handler. Verify your unit's data plate lists a 208/230V primary and 24V secondary 40VA transformer before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required. Order now for same-day shipping.