OEM Carrier 40VA Control Transformer for Model PH10JA03600GADAA

This is the factory OEM replacement transformer (part number HT01AW229) for the Carrier PH10JA03600GADAA packaged heat pump unit. The control transformer steps down line voltage (120V primary) to 24V AC on the secondary side, powering the entire low-voltage control circuit — including the thermostat, contactor coil, reversing valve solenoid, and safety switches. When this transformer fails, nothing works: the thermostat goes blank, the unit will not respond to any call for heating or cooling, and you may find a blown 3A fuse on the control board as a secondary symptom.

• Specs: 40VA rating | 120V primary / 24V secondary | Ring-style mount | Factory-matched output tolerance for stable control voltage
• OEM vs Generic: This is a genuine Carrier OEM transformer engineered to exact VA and voltage output specifications for the PH10JA03600GADAA. Generic alternatives may deliver inconsistent 24V output, causing nuisance lockouts, thermostat brownouts, or premature contactor coil failure.
• Install difficulty: 2/5 — Shut off all power to the unit before servicing. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output with a multimeter after installation before restoring full power.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier PH10JA03600GADAA packaged heat pump. Always verify your unit's data plate voltage requirements before ordering. Have your model and serial number ready — our HVAC parts specialists are standing by to confirm fitment before you buy. Order today and get same-day shipping on in-stock parts.