OEM Carrier 40VA Control Transformer HT01CN236 for Model FX4ANF018000AAAA

This OEM replacement transformer (part number HT01CN236) is the factory-specified control transformer for the Carrier FX4ANF018000AAAA fan coil unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers the control board, thermostat circuit, and all low-voltage components in your system. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no low-voltage components will operate. A failed transformer is often the first suspect when absolutely nothing in the system responds.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and voltage tolerances. Undersized or off-spec generic transformers can overheat, trip internal thermal protection, and damage sensitive control boards — making OEM the only safe choice for this application.
• Install difficulty: 2/5 — Shut off all power to the unit at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wires before disconnecting. Verify 24V output with a multimeter before closing the cabinet.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for the Carrier FX4ANF018000AAAA fan coil unit. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists confirm fitment before you buy — reach out before placing your order.