OEM Carrier 40VA Control Transformer for Model FA4ANF018010AFAA

This OEM control transformer (part# HT01CN236) is the factory-specified replacement for the Carrier FA4ANF018010AFAA air handler. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, and all low-voltage control circuitry. When this component fails, the entire control circuit loses power — your thermostat goes blank, the system won't respond to any commands, and no heating or cooling cycle can initiate. It is often the first component to check when "nothing works" and fuses or breakers test fine.

• Specs: 40VA rating | Primary: 120VAC | Secondary: 24VAC | OEM Part Number: HT01CN236 | Factory-matched output for stable low-voltage control circuits
• OEM vs Generic: OEM transformers from Carrier are wound to exact VA and voltage tolerances, protecting sensitive control boards from voltage fluctuations. Generic units frequently run outside rated tolerance, risking nuisance tripping or premature board failure.
• Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label or photograph all low-voltage wiring before disconnecting. Verify 24V output with multimeter after installation before restoring full power.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our climate-controlled warehouse.

Compatibility: Designed as the direct OEM replacement for the Carrier FA4ANF018010AFAA air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you buy — order with confidence and get back to comfort fast.