OEM Carrier 40VA Control Transformer HT01CN236 for Model FA4ANC024005AGAA

This OEM control transformer is the factory-specified replacement for the Carrier FA4ANC024005AGAA air handler. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, contactor coil, and control board. When it fails — due to a shorted control wire, failed board, or age-related insulation breakdown — the result is a completely unresponsive system: the thermostat goes dark, the air handler does nothing, and no fault codes appear because there is no power to display them.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | OEM part number HT01CN236 | Factory-matched for FA4ANC024005AGAA electrical load requirements
• OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA rating and thermal protection spec. Generic substitutes frequently run undersized VA margins, causing nuisance tripping or premature failure when control loads spike during startup.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 120V input and 24V output with your meter before and after replacement. Always inspect low-voltage wiring for shorts that may have caused the original failure — a shorted wire will blow the new transformer immediately.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier FA4ANC024005AGAA residential air handler. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If you are unsure of fitment, our HVAC parts team is available to verify compatibility before you purchase — same-day shipping available on all in-stock OEM parts.