OEM Carrier Control Transformer 40VA 120V–24V for Model PH3GNA060000AA

This is the factory OEM replacement control transformer (part number HT01BD242) for the Carrier PH3GNA060000AA packaged unit. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, the result is total system unresponsiveness: no thermostat display response, no relay clicking, and no call-for-cooling or call-for-heat being answered. A failed transformer is often misdiagnosed as a bad board, making correct identification critical before replacing more expensive components.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD242 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications required by the Carrier control board. Undersized or off-spec generic units can cause brownouts on the 24V circuit, nuisance trips, or premature control board failure.
• Install difficulty: 2/5 — Shut off all power to the unit at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Label and photograph all wiring connections before removal.
• Warranty: 1-year OEM factory warranty. In-stock units ship the same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PH3GNA060000AA packaged unit. Verify your unit's data plate voltage and VA requirements before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy — no guesswork required.