OEM Carrier 75VA Control Transformer HT01BD242 for Model PH1PEB048000AAAA

This OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the Carrier PH1PEB048000AAAA packaged heat pump unit. The control transformer steps down the high-voltage supply (208/240/480V primary) to a safe 24VAC secondary signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the result is total loss of 24V control power: the system will not respond to the thermostat, will not energize the contactor, and nothing will operate. A failed transformer is often confirmed with a multimeter by measuring zero or severely reduced voltage at the 24V secondary terminals.

• Specs: Primary Input: 208/240/480VAC | Secondary Output: 24VAC | Power Rating: 75VA | Frequency: 50/60Hz | Mounting Style: Foot Mount | OEM Part #: HT01BD242
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage specifications. Generic transformers often carry looser tolerances, which can cause under-voltage conditions that destabilize the control board and reduce contactor coil life.
• Install Difficulty: 3/5 — Requires disconnecting line-voltage wiring from the primary terminals. Always shut off power at the disconnect and verify with a non-contact voltage tester before proceeding. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade terminals, multimeter. Label all wires before disconnecting.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PH1PEB048000AAAA packaged heat pump unit. This transformer is also used across a wide range of Carrier, Bryant, Payne, and ICP-family equipment sharing the same 208/240/480V-to-24VAC 75VA control circuit requirement. Verify your unit's data plate voltage and VA rating before ordering. Our fitment team is available to confirm compatibility before you purchase — reach out before you order and ship today.