OEM Carrier 40VA Control Transformer HT01BD242 for Model PH2PPB036000AA

This OEM control transformer (part number HT01BD242) is the factory-specified replacement for the Carrier PH2PPB036000AA heat pump system. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage control circuits. When this part fails, the entire control system goes dark — the thermostat loses power, the system won't respond to calls for heating or cooling, and in some cases a blown fuse on the secondary side is the first symptom you'll notice.

• Specs: 120V primary | 24V secondary | 40VA rated | Class 2 transformer | Factory-matched output for low-voltage control circuit protection
• OEM vs Generic: OEM transformers like HT01BD242 are wound and rated to exact Carrier factory tolerances, ensuring stable 24V output under full load. Generic units may underperform at rated VA, causing intermittent control issues, nuisance lockouts, or premature fuse failures.
• Install difficulty: 2/5 — Shut off all power to the unit at the disconnect and breaker before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching wiring). Photograph all wiring connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier PH2PPB036000AA heat pump. Always verify your unit's data plate confirms 120V primary input and 24V/40VA secondary rating before ordering. Our parts specialists are available to confirm fitment — reach out before you buy if you have any questions.