OEM Carrier 40VA Control Transformer for Model C50A302562

This is the factory-specified OEM replacement control transformer for the Carrier C50A302562 packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, contactor coil, and control board. When it fails, the entire low-voltage control circuit goes dead — your thermostat loses power, the system stops responding to calls for heating or cooling, and nothing turns on. If you're measuring 0V across your 24V terminals and your breaker hasn't tripped, a failed transformer is the most common cause. OEM part numbers HT01BD236 and HT01BD702 are interchangeable factory replacements for this application.

• Specs: 40VA capacity | 120V primary / 24V secondary | Factory-matched impedance and thermal protection | Replaces OEM part numbers HT01BD236 and HT01BD702
• OEM vs Generic: OEM transformers are wound to exact VA and impedance specs for this unit. Undersized or off-spec generic transformers can overheat under contactor inrush loads, tripping the internal thermal cutoff and causing intermittent no-heat or no-cool faults that are difficult to diagnose.
• Install difficulty: 2/5 — Disconnect power at the breaker and confirm voltage is off before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Label or photograph all low-voltage wiring before disconnecting. Match primary and secondary wire colors carefully on reinstall.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C50A302562 commercial packaged rooftop unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions.