OEM Carrier Control Transformer 40VA for Model CH13NA02500GABAA

This OEM control transformer (part# HT01AW229) is the factory-specified replacement for the Carrier CH13NA02500GABAA split-system air conditioner. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, nothing in the system responds: the thermostat goes blank, the contactor never energizes, and the unit won't start at all. A failed transformer is often misdiagnosed as a thermostat or control board issue, making correct identification critical before replacing more expensive components.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 output | Factory-matched to Carrier CH13NA02500GABAA control circuit requirements
• OEM vs Generic: This OEM unit is wound and insulated to exact Carrier factory specifications. Generic transformers often carry lower VA ratings or looser voltage tolerances, which can cause nuisance tripping, control board brownouts, or premature contactor coil failure.
• Install difficulty: 2/5 — Disconnect power at the disconnect and breaker before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching and 24V after install). Always photograph or label existing wiring before disconnecting.
• Warranty: 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse.

Compatibility: Designed for the Carrier CH13NA02500GABAA condenser. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. OEM part number HT01AW229 confirms direct fitment. Have questions about compatibility? Our HVAC parts specialists verify fitment before you order — reach out before purchasing if you're unsure.