OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY4GPAA60115AA

This is the genuine OEM Carrier control transformer (part number HT01BD209), the factory-specified replacement for the Carrier PY4GPAA60115AA packaged HVAC system. The control transformer steps down high-voltage line power (208/240V) to the safe 24V signal used by your thermostat, control board, and all low-voltage components. When this transformer fails, the entire control circuit loses power — the thermostat goes dark, the system stops responding to commands, and you may notice a faint buzzing or burning smell near the air handler or packaged unit cabinet.

• Specs: 208/240V primary input | 24V secondary output | 40VA capacity | 50/60 Hz | Class 2 control transformer | Direct OEM replacement for Carrier PY4GPAA60115AA
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, protecting sensitive control boards and thermostats from under-voltage or overcurrent damage. Generic units often run outside rated VA, which can trip breakers or shorten board life.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V before touching terminals), needle-nose pliers, and wire labels or masking tape. Photograph all wiring connections before removal. Confirm primary and secondary wire leads match your unit's wiring diagram.
• Warranty & Shipping: 1-year OEM manufacturer warranty against defects. In stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY4GPAA60115AA packaged HVAC unit. Also replaces legacy Carrier part numbers HT01BD207, HT01CN232, and 9076-00 — verify your existing part number and unit data plate before ordering. Not sure if this fits? Contact our parts team and we'll confirm fitment before you buy.