OEM Carrier Transformer 40VA 120V→24V for Model PF4MNA036T00AAAA

This is the genuine OEM replacement transformer (part number HT01CN241) for the Carrier PF4MNA036T00AAAA fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, control board, and zone valves. When this transformer fails, you'll typically experience a completely unresponsive thermostat, a blank display, or a system that won't respond to any call for heating or cooling, even when the main power is confirmed on.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched OEM tolerances | Replaces OEM part number HT01CN241
• OEM vs Generic: OEM transformers are wound and rated to exact factory specifications, ensuring stable 24V output under full load. Generic units can underperform under peak demand, causing nuisance lockouts and intermittent control board faults.
• Install Difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output after install), wire nuts or spade connectors. Always label all control wires before disconnecting.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PF4MNA036T00AAAA fan coil air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.