OEM Carrier Transformer 40VA 120V/24V for Model PH13NR030000AFAA

This OEM transformer (part number HT01AW229) is the factory-specified replacement for the Carrier PH13NR030000AFAA heat pump system. The control-circuit transformer steps down line voltage (120V) to the 24V AC signal that powers the thermostat, contactor coils, and control board. When it fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, the system won't respond to calls for heating or cooling, and fuses in the control circuit may blow repeatedly.

• Specs: Input 120V AC | Output 24V AC | 40VA rated | Factory OEM part number HT01AW229 | Direct plug-in replacement
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic transformers often run underrated VA, causing thermal overload and premature failure under full control-circuit load.
• Install difficulty: 2/5 — Always shut off power at the breaker and confirm zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wire connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. Orders placed before cut-off ship same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH13NR030000AFAA heat pump. Always verify the transformer's VA rating and input/output voltages against your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — no guesswork required.