OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNA043T00ABAA

This OEM Carrier control transformer (part #HT01CN241) is the factory-specified replacement for the Carrier PF4MNA043T00ABAA fan coil and air handler unit. The transformer steps down the 208/230V line voltage to the 24V signal that powers your thermostat, control board, and all low-voltage switching circuits. When it fails, the entire control circuit goes dead — the system will not respond to the thermostat, will not stage heating or cooling, and may blow the 3A control fuse repeatedly if a secondary short is present.

• Specs: 208/230V Primary | 24V Secondary | 40VA capacity | Factory-matched OEM windings and mounting footprint for direct drop-in replacement
• OEM vs Generic: OEM Carrier transformers are wound to exact VA and voltage-regulation tolerances. Undersized or off-spec generics can cause nuisance lockouts, low-voltage brownouts on the control board, and premature failure of downstream components.
• Install difficulty: 2/5 — Always disconnect power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output before closing the unit). Photograph all low-voltage wire connections before removing the old transformer.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PF4MNA043T00ABAA fan coil/air handler. Verify your unit's data plate shows a 208/230V primary supply before ordering. Need fitment confirmation? Our HVAC parts team verifies compatibility before you buy — contact us today and get your system back online fast.