OEM Carrier Control Transformer 60VA 115/208/230V — HT01AW229 for Model PH10JA01800GAHAA

This OEM foot-mounted control transformer (part number HT01AW229) is the factory-specified replacement for the Carrier PH10JA01800GAHAA. The control transformer steps down line voltage (115, 208, or 230V primary) to the 24V AC signal that powers your thermostat, control board, and every safety relay in the system. When this transformer fails — whether from a shorted secondary load, a blown fuse, or simple age — the entire control circuit goes dark: the thermostat goes blank, the system won't call for heat or cool, and no error codes are generated because the board itself has no power.

• Specs: 60 VA rating | Primary voltage: 115 / 208 / 230 VAC | Secondary voltage: 24 VAC | Foot-mounted configuration | OEM part number HT01AW229 / HT01AW229A
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part engineered to exact VA and impedance specifications. Generic transformers frequently run under-rated VA capacity, causing premature thermal shutoff and nuisance trips on larger control loads common in commercial packaged equipment.
• Install difficulty: 2/5 — Shut off all power at the disconnect before working on the transformer. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching terminals). Label and photograph all wiring connections before removing the old unit. Confirm primary tap selection matches your supply voltage.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier PH10JA01800GAHAA. Always verify your unit's data plate voltage and confirm the 60 VA rating meets your system's control circuit load before ordering. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today.