OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNB061000AAAA

This is the genuine OEM replacement control transformer for the Carrier PF4MNB061000AAAA fan coil and air handler. The transformer steps down line voltage (208/230V primary) to the 24V signal voltage that powers every component in your control circuit — thermostat, relays, zone boards, and contactors. When it fails, the entire control system goes dark: the thermostat loses power, the system won't respond to any calls for heating or cooling, and nothing runs. A failed transformer is one of the most common causes of a completely unresponsive HVAC system.

• Specs: 208/230V Primary | 24V Secondary | 40VA rated | OEM Part # HT01CN241 | Factory-matched to Carrier PF4MNB061000AAAA specifications
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part built to exact OEM tolerances. Generic transformers often underperform at rated VA, causing nuisance tripping of the internal fuse and premature failure under normal HVAC load.
• Install difficulty: 2/5 — Turn off all power at the breaker and air handler disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label and photograph all wiring before disconnecting. Confirm primary voltage matches your supply before energizing.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PF4MNB061000AAAA fan coil/air handler. Verify your unit's data plate shows 208/230V primary supply before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.