OEM Carrier 40VA Control Transformer HT01AW229 for Model PH13PR04800GACAA

This OEM step-down transformer is the factory-specified replacement for the Carrier PH13PR04800GACAA packaged heat pump unit. Its job is to convert 120V line voltage down to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, absolutely nothing in the control system responds: the thermostat goes blank, the contactor won't energize, and the system will not heat or cool. It is often the first component to diagnose when a unit shows zero control activity.

• Specs: 120V primary | 24V secondary | 40VA rated | OEM part number HT01AW229 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic transformers can under-deliver on VA capacity, causing voltage sag that leads to nuisance lockouts, contactor chatter, and premature control board failure.
• Install difficulty: 2/5 — Disconnect and lock out power before servicing. Tools needed: multimeter (to verify 24V output post-install), insulated screwdrivers, wire nuts or terminals. Always verify secondary voltage with a meter before restoring full system power.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Engineered for the Carrier PH13PR04800GACAA packaged heat pump. Always confirm your existing transformer's primary voltage, secondary voltage, and VA rating on the unit's data plate or wiring diagram before ordering. Our HVAC parts specialists are available to verify fitment — just ask before you buy.