OEM Carrier 40VA Control Transformer for Model C50A502562

This OEM control transformer is the factory-specified replacement for the Carrier C50A502562 packaged unit. The transformer steps down line voltage (120V) to the 24V signal required by your thermostat, control board, and all low-voltage safety circuits. When it fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system won't call for heating or cooling, and no fault codes will display. OEM part numbers HT01BD236 and HT01BD702 are factory-direct replacements with identical form, fit, and function.

• Specs: 40VA rated | 120V primary / 24V secondary | Factory-matched OEM windings | Integrated auto-reset thermal protection on select configurations
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-spec generic units can brown out under peak load — especially in systems with multiple zone valves or accessories drawing from the 24V circuit — leading to nuisance lockouts and premature board failure.
• Install difficulty: 2/5 — Disconnect power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V at primary terminals before touching wiring). Photograph all wire connections before removal. Mount, reconnect, and confirm 24V output before closing the cabinet.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C50A502562 commercial rooftop/packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. OEM part numbers HT01BD236 and HT01BD702 are cross-referenced to this model. Have questions about fitment? Our HVAC parts specialists verify compatibility before you order — reach out before purchasing.