OEM Carrier Control Transformer 75VA 208/240/480V to 24VAC — Model PH1PPB036000AAAA

This OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the Carrier PH1PPB036000AAAA packaged heat pump unit. The transformer steps down high-voltage line power (208/240/480V) to the 24VAC low-voltage signal that powers your thermostat, contactor coils, and control board. When this part fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat display, no contactor pull-in, and no heating or cooling operation whatsoever.

• Specs: 75VA power rating | 208/240/480V primary input | 24VAC secondary output | 50/60Hz | Foot-mount configuration | OEM part #HT01BD242
• OEM vs Generic: This is a genuine Carrier OEM transformer engineered to exact factory tolerances. Generic transformers often use lower-grade core materials and thinner wire windings, leading to voltage sag under load and premature thermal failure — both of which can damage downstream control boards.
• Install difficulty: 3/5 — Line-voltage terminals are present; always shut off power at the disconnect and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter. Label all wires before disconnecting. Foot-mount design requires securing to the equipment panel before reconnecting leads.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Directly replaces the factory-installed transformer in Carrier model PH1PPB036000AAAA packaged heat pump units. This transformer is also used across multiple Carrier, Bryant, and ICP-family packaged and split-system platforms — always verify your unit's data plate input voltage matches the 208/240/480V primary before ordering. Our HVAC parts specialists are available to confirm fitment before you buy.