OEM Carrier Transformer 75VA 240/480V to 24VAC for Model PH3GNA036000AB

This OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the Carrier PH3GNA036000AB packaged unit. The transformer steps down high-voltage primary power (208/240/480V) to the 24VAC control circuit voltage that powers your thermostat, contactor coils, and integrated control board. When this part fails, the entire control circuit goes dead — your system will not respond to thermostat calls, and no components will energize. A failed transformer is often misdiagnosed as a board failure, making correct identification critical before ordering additional parts.

• Specs: 75VA rated | 208/240/480V primary | 24VAC secondary | 50/60Hz | Foot-mount configuration | OEM part #HT01BD242
• OEM vs Generic: This is the genuine Carrier OEM part — factory-matched VA rating and voltage tolerances ensure your control board and low-voltage components receive stable, clean 24VAC. Off-brand transformers with loose VA ratings can cause nuisance tripping of fuses and premature board failures.
• Install difficulty: 2/5 — Turn off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24VAC output after install). Always label low-voltage wiring with tape before disconnecting. Check for a blown 3A or 5A inline fuse on the secondary side — a shorted transformer often blows it.
• Warranty: 90-day OEM manufacturer warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Confirmed fit for Carrier model PH3GNA036000AB packaged unit. This transformer is also widely used across Carrier, Bryant, Payne, Tempstar, Heil, and Comfortmaker equipment sharing the same control circuit architecture. Verify your primary voltage (208/240V or 480V) against your unit's data plate before ordering. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions.