OEM Carrier Control Transformer 40VA 120V–24V for Model PF4MNA030T00AAAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier PF4MNA030T00AAAA air handler. The transformer steps down line voltage (120V) to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, control board, zone valves, and relays. When this component fails, nothing in the system responds: the thermostat goes blank, the blower won't start, and the unit is completely unresponsive to any call for heating or cooling.

• Specs: Input 120V AC | Output 24V AC | 40VA rating | Class 2 low-voltage output | Factory-matched to Carrier PF4MNA030T00AAAA wiring harness
• OEM vs Generic: The OEM HT01CN241 transformer delivers precise voltage regulation and is rated to the exact VA load required by the Carrier control board. Undersized or off-brand units can cause erratic thermostat behavior, nuisance tripping, or premature control board failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to verify output voltage post-install. Label all low-voltage wires before disconnecting.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM.

Compatibility: Engineered specifically for the Carrier PF4MNA030T00AAAA air handler. Verify your existing transformer's input voltage, output voltage, and VA rating on the unit data plate or existing component label before ordering. Our parts team is available to confirm fitment — just reach out before you buy.