OEM Carrier 40VA Control Transformer HT01CN241 for Model PF4MNA042L00AAAA

This is the factory OEM replacement control transformer for the Carrier PF4MNA042L00AAAA fan coil unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this part fails, the entire control circuit goes dead — your thermostat displays nothing, the system refuses to respond to any call for heating or cooling, and in some cases a blown fuse on the control board is the first symptom. Replacing the transformer with a genuine OEM unit is the fastest path back to full system operation.

• Specs: OEM Part # HT01CN241 | Input: 120V AC | Output: 24V AC | 40VA rating | Direct factory-matched replacement
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic units can overheat, nuisance-trip, or damage downstream control components.
• Install Difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Always label wires before disconnecting terminals.
• Warranty: 1-year OEM factory warranty included. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier PF4MNA042L00AAAA fan coil unit. Verify OEM part number HT01CN241 against your unit's data plate and wiring diagram before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork.