OEM Carrier 75VA Control Transformer HT01BD242 for Model PH3GPAA48000AA

This OEM Carrier control transformer (part number HT01BD242) is the factory-specified replacement for the Carrier PH3GPAA48000AA packaged heat pump unit. The transformer steps down high-voltage line power to a safe 24VAC signal that energizes the entire low-voltage control circuit — including the thermostat, contactor coil, reversing valve, and control board. When this transformer fails, nothing in the system responds: the thermostat goes blank, the unit won't call for heating or cooling, and no safety circuits can operate. It is one of the first components a technician should check on a completely unresponsive system.

• Specs: Primary input 208/240/480V | Secondary output 24VAC | 75VA power rating | 50/60Hz | Foot-mount configuration | OEM part number HT01BD242
• OEM vs Generic: This is a genuine Carrier OEM transformer wound and rated to exact factory specifications. Off-brand replacements frequently carry inferior VA ratings or looser voltage tolerances, risking control board damage or nuisance trips on sensitive packaged units.
• Install difficulty: 3/5 — Disconnect all power before servicing. Tools needed: multimeter (verify 24VAC output after install), wire nuts or spade terminals, screwdriver set. Always confirm primary voltage tap matches your supply voltage before energizing. Improper tap selection can immediately destroy the transformer.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Engineered as the direct OEM replacement for Carrier PH3GPAA48000AA packaged heat pump units. This transformer is also used across a wide range of Carrier, Bryant, Payne, and ICP family packaged and split systems — always verify your unit's data plate voltage and the existing transformer's VA rating before ordering. Our parts specialists are available to confirm fitment before you buy.