OEM Carrier Transformer 40VA 120V–24V for Model FPAA100D34CN

This is the factory OEM replacement transformer (part number HT01BC116) for the Carrier FPAA100D34CN packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the entire low-voltage control circuit — including your thermostat, contactor coil, gas valve, and control board. When the transformer fails, nothing in the system responds: the thermostat goes dark, the unit won't start, and you may measure zero voltage on the 24V secondary terminals. A blown transformer is often caused by a short in the low-voltage wiring, so always inspect control wiring before installing the replacement.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Factory-matched terminals for direct drop-in installation
• OEM vs Generic: This OEM unit is wound to exact factory VA and voltage specifications. Undersized or off-tolerance generic transformers overheat under normal control-circuit load, leading to repeat failures and potential control board damage.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Test secondary voltage output after installation before re-energizing the full system. Always check for downstream short circuits first.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model FPAA100D34CN. Verify your existing transformer's primary/secondary voltage and VA rating on its label before ordering to confirm fitment. Our team is available to verify compatibility before you purchase — reach out anytime.