OEM Carrier 40VA Control Transformer HT01CN241 for Model PF4MNA043T00AAAA

This is the genuine OEM Carrier control transformer (part number HT01CN241), the factory-specified replacement for the Carrier PF4MNA043T00AAAA air handler. The transformer steps down line voltage from 208/230V to 24V AC to power the low-voltage control circuit — including the thermostat, relay coils, and safety switches. When it fails, the entire control circuit goes dead: the thermostat loses power, nothing calls for heating or cooling, and the system appears completely unresponsive. A failed transformer is often misdiagnosed as a thermostat or control board issue, so always verify 24V output at the secondary terminals before replacing other components.

• Specs: 208/230V Primary | 24V Secondary | 40VA rated | OEM part number HT01CN241 | Direct factory replacement
• OEM vs Generic: This genuine Carrier OEM transformer is wound to exact factory VA and voltage tolerances. Generic units can run under-rated VA, causing brownouts in the control circuit, nuisance tripping, or premature failure of the control board.
• Install difficulty: 2/5 — Shut off all power at the breaker and disconnect switch before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring connections before removing the old unit. Verify 24V output with a multimeter after installation before closing the panel.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as a direct OEM replacement for the Carrier PF4MNA043T00AAAA air handler. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping available on in-stock orders.