OEM Carrier Control Transformer 120V–24V 40VA for Model PH2PEB042000AB

This OEM control transformer (part# HT01BD242) is the factory-specified replacement for the Carrier PH2PEB042000AB packaged heat pump unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, contactor coil, and all low-voltage safety circuits. 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 measure 0V on the R and C terminals of the control board. It is one of the most common single-point failures in any packaged HVAC system.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | Factory OEM part number: HT01BD242 | Meets original factory electrical specifications
• OEM vs Generic: This is a genuine OEM Carrier transformer, wound and rated to exact factory tolerances. Generic transformers frequently run under-rated VA capacity, causing thermal overloads, nuisance fuse failures, and shortened control board life.
• Install difficulty: 2/5 — Shut off power to the unit at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring before disconnecting. Verify 24V output with a multimeter after installation before restoring full power.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed and factory-matched for the Carrier PH2PEB042000AB packaged heat pump (4-ton, R-410A). Always confirm your unit's data plate shows the HT01BD242 part number or matching 120V/24V/40VA transformer specification before ordering. Our team is available to verify fitment — order with confidence and get same-day shipping directly to your door.