OEM Carrier Transformer 40VA 120V/24V for Model FE4ANB005000AAAA

This is the factory OEM replacement transformer (part number HT01CN236) for the Carrier FE4ANB005000AAAA air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your entire control circuit — including the thermostat, control board, contactor coil, and zone valves. When this transformer fails, nothing in the system responds: the thermostat goes blank, the blower won't start, and no call for heating or cooling reaches the equipment. A blown transformer is often the first casualty of a shorted low-voltage wire or a miswired thermostat.

• Specs: 40VA rating | 120V primary / 24V secondary | Hardwired leads | Factory-matched impedance and thermal overload protection for Carrier FE4ANB series air handlers
• OEM vs Generic: OEM part HT01CN236 is wound to Carrier's exact VA and impedance spec. Generic transformers often underperform at peak load, causing nuisance lockouts and premature control board failure — particularly in multi-zone applications where 24V demand spikes.
• Install difficulty: 2/5 — Shut off power at the breaker and verify zero voltage with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Label and photograph all wiring before disconnecting. After installation, check secondary output: should read 24–28V AC under no-load.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier FE4ANB005000AAAA fan coil air handler. Always verify your existing transformer's VA rating and lead configuration against your unit's wiring diagram before ordering. If you're unsure of fitment, our parts team will confirm compatibility before your order ships.