OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
This OEM control circuit transformer (part# HT01AW230) is the factory-specified replacement for the Carrier FD3ANA030000AAAA fan coil unit. The transformer steps down 230V line voltage to the 24V signal that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — your thermostat will appear dead, the system won't respond to any commands, and nothing will operate even if the line voltage supply is intact.
Compatibility: Engineered specifically for the Carrier FD3ANA030000AAAA fan coil unit. Always verify your unit's data plate voltage requirements match the 230V primary / 24V secondary specification before ordering. Our HVAC parts specialists are available to confirm fitment prior to purchase — don't guess on a control circuit component. Order today and receive same-day shipping on in-stock OEM parts.