OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF1MNC037T00AAAA

This OEM Carrier transformer (part #HT01CN241) is the factory-specified 24V control circuit transformer for the Carrier PF1MNC037T00AAAA fan coil and air handler. Its job is to step down the 208/230V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching. When this transformer fails, the entire control circuit goes dark — the thermostat shows no response, the system won't call for heating or cooling, and no relay or valve will operate. A failed transformer is often mistaken for a bad control board, so always check transformer output voltage first with a multimeter before ordering other components.

• Specs: 208/230V Primary | 24V Secondary | 40VA Power Rating | Direct OEM replacement for part #HT01CN241
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, engineered to exact VA and voltage tolerances. Generic transformers with loose VA ratings can cause erratic thermostat behavior and shorten control board life due to voltage sag under load.
• Install difficulty: 2/5 — Always shut off power at the breaker before replacing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph or label all low-voltage wiring before disconnecting. Most techs complete this replacement in under 20 minutes.
• Warranty: Covered by Carrier's 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse.

Compatibility: Factory-matched replacement for Carrier model PF1MNC037T00AAAA. Also widely used across Carrier air handlers, fan coil units, and heat pump systems requiring a 208/230V-to-24V 40VA step-down transformer. Verify your unit's control board input voltage and VA requirement on the data plate before ordering. Need fitment help? Our HVAC parts specialists confirm compatibility before you buy — order with confidence and get it shipped today.