OEM Carrier Control Transformer 40VA 208/240V–24V for Model PY3GPAA60115AA

This OEM control transformer (part #HT01BD209) is the factory-specified 40VA step-down transformer for the Carrier PY3GPAA60115AA packaged HVAC unit. It converts 208/240V line voltage down to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coils, gas valve solenoid, and control board. When this transformer fails, the entire control circuit goes dark: the thermostat loses power, the system will not respond to calls for heating or cooling, and in some cases a shorted secondary winding will trip a fuse or breaker on the control board. Replacing a failed transformer is one of the most impactful and cost-effective repairs in HVAC service.

• Specs: 208/240V Primary | 24V Secondary | 40VA rated | 50/60Hz | Class 2 control transformer | OEM part #HT01BD209 | Replaces legacy part numbers HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic transformers frequently under-deliver VA capacity, causing nuisance shutdowns, overheating, and premature failure of downstream control boards and contactors.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V before touching terminals), wire labels or camera to document wiring. Reconnect primary wires first, then secondary. Confirm 24V output with a meter before closing the unit.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — order before 3 PM local time for guaranteed same-day dispatch.

Compatibility: Direct OEM replacement for Carrier model PY3GPAA60115AA packaged gas/electric units. Cross-references to part numbers HT01BD207, HT01CN232, and 9076-00 — confirm your existing transformer's primary voltage (208/240V) and VA rating (40VA) on the data plate before ordering. Our fitment team is available to verify compatibility before you buy.