OEM Carrier 75VA Control Transformer HT01BD242 for Model PH1PNB036000ABAA

This OEM Carrier transformer (part number HT01BD242) is the factory-specified replacement for the Carrier PH1PNB036000ABAA packaged heat pump unit. The transformer steps down high-voltage supply power — 208, 240, or 480V primary — to the 24VAC secondary signal that powers your thermostat, control board, and all low-voltage safety circuits. When this part fails, nothing works: the thermostat goes dark, the system refuses to respond to any call for heating or cooling, and you may find a blown 3A or 5A fuse on the control board as a secondary symptom.

• Specs: 75VA rating | 208/240/480V primary | 24VAC secondary | 50/60Hz | Foot-mount design | Factory-matched windings for exact voltage regulation
• OEM vs Generic: OEM transformers from Carrier deliver tightly regulated 24VAC output, protecting sensitive control boards and communicating thermostats. Generic units can drift under load, causing erratic lockouts, nuisance tripped fuses, and premature board failures.
• Install difficulty: 3/5 — Line voltage is present at the primary terminals; always shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24VAC output post-install and check for shorted secondary before energizing). Label all low-voltage wires before disconnecting.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH1PNB036000ABAA packaged heat pump unit. This transformer also cross-applies across Carrier, Bryant, Payne, Tempstar, Heil, and Comfortmaker platforms sharing the HT01BD242 specification — always verify primary voltage configuration and VA rating on your unit's data plate before ordering. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy.