OEM Carrier Control Transformer 40VA 208/230V–24V for Model PF4MNB049L00ACAA

This is the genuine OEM Carrier replacement transformer (part number HT01CN241) for the PF4MNB049L00ACAA air handler. The transformer is the backbone of your system's low-voltage control circuit — it steps down 208/230V line voltage to the 24V signal power that runs your thermostat, control board, contactor coils, and zone valves. When it fails, the entire control circuit goes dark: your thermostat loses communication, the system won't respond to calls for heating or cooling, and no components will energize. A failed transformer is one of the most common causes of a completely unresponsive HVAC system.

• Specs: 208/230V Primary | 24V Secondary | 40VA power rating | Direct OEM drop-in replacement | Factory-matched winding tolerances
• OEM vs Generic: OEM transformers are wound to exact Carrier specifications, delivering a stable 24V output under full load. Generic units may sag under load voltage, causing nuisance lockouts, erratic thermostat behavior, and premature control board failure.
• Install Difficulty: 2/5 — Disconnect all power before beginning. Identify and label all 24V secondary wires before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always restore power and check output voltage before closing the unit.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Engineered as a factory-specified replacement for the Carrier PF4MNB049L00ACAA air handler. Confirm 208/230V primary supply voltage and 24V/40VA control circuit requirements on your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before every order — reach out before you buy.