OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNA037000ABAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier PF4MNA037000ABAA air handler. The control transformer steps down 208/230V line voltage to the 24V signal required by your thermostat, control board, and all low-voltage HVAC components. When this part fails, the entire control circuit goes dead — your thermostat will show a blank screen or no response, and the system will not heat, cool, or run the blower regardless of thermostat input. A failed transformer is often misdiagnosed as a bad thermostat or control board, making correct identification critical before replacing more expensive components.

• Specs: 208/230V Primary | 24V Secondary | 40VA Power Rating | Basler Electric Model BE28316007 | Factory-matched OEM tolerances
• OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA and voltage specifications. Generic units with undersized VA ratings can overheat under peak load, trip internal breakers, or fail prematurely — risking collateral damage to your control board.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always photograph wiring before disconnecting leads. Standard wire-nut reconnection; no special tools required.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PF4MNA037000ABAA air handler. Also fits other Carrier, Bryant, and Payne equipment specifying HT01CN241 with a 208/230V primary and 24V/40VA secondary — always verify the part number on your unit's data plate or existing transformer label before ordering. Need help confirming fitment? Our HVAC parts team verifies compatibility before you buy.