OEM Carrier Control Transformer 40VA 208/230V to 24V for Model PY3PPA042060AA

The Carrier HT01BD209 is the factory OEM control transformer for the PY3PPA042060AA packaged heat pump unit. This transformer steps down line voltage (208/230V primary) to the 24V AC signal that powers your thermostat, control board, and every low-voltage component in the system. When this transformer fails, the entire control circuit goes dark — symptoms include a completely unresponsive thermostat, a blank display, or a system that simply won't respond to any call for heating or cooling despite power being present at the unit.

• Specs: 40VA capacity | 208/230V primary input | 24V secondary output | 50/60 Hz | Direct OEM replacement for Carrier part HT01BD209 | Replaces legacy P/Ns HT01BD207 and HT01CN232
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage specifications. Generic transformers often carry under-rated VA capacity, causing premature thermal cutout trips and unreliable low-voltage signal delivery to the control board.
• Install difficulty: 3/5 — Disconnect all power before servicing. Tools needed: multimeter (to verify 24V output post-install), flathead and Phillips screwdrivers, wire stripper, and electrical tape or wire nuts. Always label or photograph existing wire connections — primary and secondary leads must be connected correctly to prevent control board damage.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered by 3PM local time.

Compatibility: Engineered as the direct OEM replacement transformer for Carrier model PY3PPA042060AA. Verify your unit's data plate confirms 208/230V primary voltage before ordering. Not sure it fits? Our HVAC parts team will verify fitment before you order — no guesswork, no return hassle.