OEM Carrier Control Transformer 40VA 208/230V to 24V — HT01BD209 for Model PY3PPA060115AA

This genuine OEM Carrier control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3PPA060115AA packaged unit. The transformer steps down 208/230V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and every other low-voltage component in the system. When it fails, nothing works — the thermostat goes dark, the system won't respond to any call for heating or cooling, and you may measure zero voltage at the 24V secondary terminals. Replacing the transformer is typically the fastest, lowest-cost fix to restore full system operation.

• Specs: 208/230V primary | 24V secondary | 40VA rating | 50/60 Hz | OEM part number HT01BD209 | Also cross-references 4000A46E07AE28, HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic aftermarket units can run outside tolerance, causing nuisance tripping of low-voltage fuses or premature control board failure — not a risk worth taking on a $200+ board.
• Install difficulty: 2/5 — Turn off power at the disconnect and breaker before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 0V before touching, and 24V after install), wire nuts or quick-connect terminals. Always photograph or label all wiring before disconnecting. The transformer mounts to the blower compartment panel — typically two screws.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Direct OEM replacement for Carrier model PY3PPA060115AA packaged gas/electric unit. Verify primary voltage on your unit's data plate (208V or 230V) before ordering — this transformer supports both. Not sure it fits? Our HVAC parts specialists verify fitment before you order. Order now and ship today.