OEM Carrier Transformer 40VA 120V to 24V for Model FV4CNB006T00AAAA

This is the factory OEM replacement transformer (part number HT01CN236) designed for the Carrier FV4CNB006T00AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage system components. When this transformer fails, the entire control circuit loses power — the thermostat goes blank, the system stops responding to calls for heating or cooling, and no components operate. Replacing a failed transformer is one of the most cost-effective repairs in HVAC service.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched for Carrier FV4CNB006T00AAAA air handlers
• OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and insulation class specifications. Generic transformers often carry marginal VA ratings that can sag under full control circuit load, causing intermittent faults and premature failure of downstream components like contactors and control boards.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Verify 0V at the primary terminals before touching any wiring. Label or photograph all low-voltage wiring connections prior to removal.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Carrier FV4CNB006T00AAAA fan coil air handler. Always verify your unit's data plate voltage requirements and existing transformer VA rating before ordering. If your control board or thermostat wiring shows signs of overload damage, inspect those components as well — a shorted control circuit is a common cause of transformer failure. Have a question about fitment? Our HVAC parts specialists verify compatibility before you order. In stock — ships today.