OEM Carrier 40VA Control Transformer for Model C50A402762 — HT01BD236 / HT01BD702

This OEM replacement control transformer is the factory-specified unit for the Carrier C50A402762 packaged system. The transformer steps down 120V primary voltage to the 24V AC signal that powers the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When it fails, the system goes completely silent: no thermostat response, no contactor pull-in, no ignition sequence. It is often the first component to check when nothing in the system responds at all.

• Specs: 40VA rating | 120V primary / 24V secondary | Compatible OEM part numbers: HT01BD236 and HT01BD702 | Factory-matched winding insulation and thermal protection
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for the Carrier C50A402762 control circuit. Undersized or off-tolerance generic units can overheat under load, trip internal thermal cutoffs, or deliver unstable 24V output that causes erratic board and thermostat behavior.
• Install difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph all low-voltage wiring before disconnecting terminals.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier C50A402762 commercial rooftop/packaged unit. Cross-references OEM part numbers HT01BD236 and HT01BD702 — both are direct replacements for this application. Always verify your unit's data plate voltage and VA rating before ordering to ensure an exact match. Have a question about fitment? Our HVAC parts specialists confirm compatibility before your order ships.