OEM Carrier Control Transformer 208/240V to 24V 40VA for Model PY4GPAA30060AA

This OEM Carrier transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY4GPAA30060AA packaged unit. The transformer steps high-line voltage (208/240V) down to the 24V DC control circuit voltage that powers your thermostat, contactor coil, gas valve, and every other low-voltage component. When this part fails, the entire control circuit goes dark — no thermostat response, no staging, no operation whatsoever. Replacing a failed transformer immediately restores system communication and prevents misdiagnosis of otherwise functioning components.

• Specs: Input 208/240V | Output 24V | Power Rating 40VA | Frequency 50/60Hz | OEM Part # HT01BD209 | Also replaces HT01CN232
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory tolerances, ensuring steady 24V output under full load. Undersized or off-tolerance aftermarket units can cause erratic thermostat behavior, nuisance lockouts, and premature contactor coil failure.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before proceeding. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label and photograph all wire connections before disconnecting the old unit. Verify 24V output at secondary terminals after installation before restoring the system to operation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY4GPAA30060AA packaged unit. Verify your unit's control voltage requirement on the data plate before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence or contact us first.