OEM Carrier Transformer 75VA 208/240/480V to 24VAC for Model PH2PPB042000AB

This OEM Carrier control transformer (part #HT01BD242) is the factory-specified replacement for the Carrier PH2PPB042000AB packaged heat pump unit. The transformer steps down high-voltage line power (208, 240, or 480V primary) to the 24VAC signal required to operate all low-voltage control circuit components — including the thermostat, contactor coil, reversing valve solenoid, and any safety controls. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no safety board LEDs illuminate. In some cases, a failed transformer will trip its internal thermal fuse due to a downstream short, so always inspect low-voltage wiring for shorts before installing a replacement.

• Specs: 75VA power rating | Primary input: 208/240/480V | Secondary output: 24VAC | Frequency: 50/60Hz | Foot-mount configuration | OEM part #HT01BD242
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic aftermarket transformers often run underrated VA capacity, causing thermal overload on systems with higher-draw accessories like economizers or multiple zone valves.
• Install Difficulty: 3/5 — Requires disconnecting line voltage (208–480V) at the disconnect box before any work begins. Tools needed: multimeter (to verify output 24VAC post-install and check for low-voltage shorts), screwdrivers, wire nuts or spade connectors. Confirm no wiring short exists on the 24V secondary circuit before energizing. Recommended for qualified HVAC technicians.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as a direct OEM replacement for Carrier PH2PPB042000AB packaged heat pump units. The 75VA rating supports the full low-voltage control load of this platform. Verify your existing transformer's input voltage tap (208/240/480V) matches your building supply voltage before ordering. Have your model and serial number ready — our HVAC parts specialists are available to confirm fitment before you buy.