OEM Carrier Control Transformer 40VA for Model C4850C50ZG060500

This is the factory OEM replacement control transformer (part# HT01BD236) for the Carrier C4850C50ZG060500 packaged unit. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this component fails, nothing works: the thermostat goes blank, the system won't respond to any call for heating or cooling, and you may detect a burnt smell or a tripped fuse on the secondary side.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched for Carrier packaged unit applications
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage specifications. Generic transformers frequently underperform on VA rating, causing nuisance fuse trips and unreliable control voltage, especially during multi-stage or heat pump demand cycles.
• Install difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph all wire connections before removing the old unit. Secondary fuse should be inspected and replaced if blown.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed specifically for the Carrier C4850C50ZG060500 packaged gas/electric unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If you're unsure of fitment, our HVAC parts team is available to confirm compatibility before you buy — typically within one business day.