OEM Carrier Transformer 120V–24V 40VA for Model PH14NA030000AAAA

This OEM step-down transformer (part# HT01AW229) is the factory-specified replacement for the Carrier PH14NA030000AAAA heat pump system. The transformer steps line voltage down from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this part fails, the entire control circuit goes dead: the thermostat goes blank, the system stops responding to calls for heating or cooling, and nothing runs despite power being present at the unit.

• Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | Replaces OEM Part# HT01AW229 | Direct plug-in replacement, no modifications required
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage specifications. Generic transformers often have loose voltage tolerances that can cause nuisance lockouts, contactor chatter, or shortened control board life.
• Install Difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Always label or photograph low-voltage wire connections before removing the old unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed and factory-matched for the Carrier PH14NA030000AAAA heat pump. Verify your unit's data plate lists 120V primary / 24V secondary and 40VA rating before ordering. Our team is available to confirm fitment — reach out before you buy if you have any questions.