OEM Carrier Transformer 40VA 120V to 24V for Model FV4CNF002T00AAAA

This is the factory OEM replacement transformer (part number HT01CN236) for the Carrier FV4CNF002T00AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers every component in your control circuit — thermostat, contactor coil, gas valve, and control board. When this transformer fails, the entire system goes dark: no thermostat response, no staging, no operation whatsoever. A blown fuse on the secondary side or a burned winding are the most common failure modes, and both require a full transformer replacement.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Direct OEM replacement for part number HT01CN236
• OEM vs Generic: This factory-matched OEM unit meets Carrier's exact VA rating and insulation class specifications. Undersized or off-brand transformers can overheat under normal load, trip thermal protection, and damage downstream control boards — making OEM the only reliable choice for a long-term fix.
• Install difficulty: 2/5 — Shut off power at the disconnect and verify with a multimeter before handling. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wiring connections before disconnecting. Check and replace the 3A control circuit fuse if present before restoring power.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Engineered specifically for the Carrier FV4CNF002T00AAAA fan coil air handler. Always verify your existing transformer's VA rating and voltage markings on the data plate before ordering to ensure correct fitment. Our HVAC parts specialists are available to confirm compatibility before you purchase — no guesswork, no return hassle.