OEM Carrier 40VA Control Transformer HT01CN241 for Model FB4CNP018L00AAAA

This OEM control transformer (part# HT01CN241) is the factory-specified replacement for the Carrier FB4CNP018L00AAAA air handler. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the result is total system shutdown: the thermostat goes blank, no stages call, and nothing responds. A failed transformer is often caused by a shorted control wire or a failed component drawing excess current, so always inspect the low-voltage circuit before installing a replacement.

• Specs: 40VA rated | 120V primary / 24V secondary | Direct OEM replacement | Part number HT01CN241 | Factory-matched to Carrier FB4CNP018L00AAAA air handler control circuit
• OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact VA and voltage tolerances. Generic transformers with loose VA ratings can overheat under normal load, tripping thermal cutoffs and causing intermittent lockouts. OEM ensures consistent 24V output across all control components.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdriver, needle-nose pliers, multimeter. Verify 0V at primary terminals before handling. Check for shorted low-voltage wiring prior to energizing the new transformer to prevent immediate re-failure.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed specifically for the Carrier FB4CNP018L00AAAA fan coil air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering. If your low-voltage fuse (typically 3A or 5A) has blown alongside the transformer, replace it as well and inspect all thermostat wiring for shorts. Our parts specialists are available to confirm fitment before you order — no guesswork required.