OEM Carrier 24V Control Transformer 40VA for Model PF4MNA025000AAAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier PF4MNA025000AAAA air handler. The transformer steps down 120V primary line voltage to a safe 24V secondary signal used to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this part fails, absolutely nothing responds: no fan, no heat, no cooling. The whole system appears dead even though line voltage is present.

• Specs: 120V primary | 24V secondary | 40VA rating | Factory OEM construction | Replaces HT01CN241 directly
• OEM vs Generic: OEM transformers use factory-wound coils rated to exact VA tolerances. Generic units are often under-rated at sustained loads, leading to premature thermal cutout trips and repeat failures — especially in systems with multiple 24V accessories.
• Install Difficulty: 2/5 — Shut off power at the breaker and verify with a meter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before the cutoff.

Compatibility: Engineered specifically for the Carrier PF4MNA025000AAAA air handler. Always verify your unit's data plate voltage and VA requirements before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — no guesswork required.