OEM Carrier 40VA Control Transformer for Model C4850C50ZN035600

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C4850C50ZN035600 packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dead — the thermostat loses power, the system won't respond to any heating or cooling calls, and often the unit appears completely unresponsive despite line voltage being present at the unit.

• Specs: 40VA rating | 120V primary / 24V secondary | Designed to OEM factory tolerances | Replaces Carrier OEM part number HT01BD236
• OEM vs Generic: This is a genuine OEM Carrier transformer engineered to exact VA and voltage specifications for your unit. Generic transformers frequently underrate their true VA capacity, causing nuisance tripping of the internal fuse under normal load and leading to repeat failures within months.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Photograph all wiring connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. Orders placed by 3 PM local time ship same business day from our climate-controlled warehouse.

Compatibility: Engineered for the Carrier C4850C50ZN035600 packaged unit. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy — no guesswork required.