OEM Carrier Control Transformer 40VA 208/230V–24V for Model PF1MNC048000AAAA

This OEM Carrier control transformer (part #HT01CN241) is the factory-specified replacement for the Carrier PF1MNC048000AAAA fan coil / air handler unit. The transformer steps down the 208/230V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system will not respond to any call for heating or cooling, and no fault codes can even be generated. A failed transformer is often misdiagnosed as a bad control board, so always check transformer output voltage first.

• Specs: 208/230V primary | 24V secondary | 40VA power rating | Direct OEM replacement for Carrier part #HT01CN241
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances, protecting sensitive control boards from over- or under-voltage. Generic units may drift outside spec under load, causing intermittent control failures and premature board damage.
• Install difficulty: 2/5 — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Verify 0V at terminals before disconnecting wires. Label all low-voltage leads prior to removal. Confirm 24V output at secondary terminals before closing the unit.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Fits Carrier model PF1MNC048000AAAA fan coil/air handler units. Verify your existing transformer's primary voltage (208/230V) and VA rating (40VA) against your unit's data plate before ordering. Our parts specialists are available to confirm fitment — contact us before you order. In stock and ships today.