OEM Carrier Control Transformer 40VA 208/230V to 24V for Model PY3PPA036090NB

This genuine OEM Carrier control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3PPA036090NB packaged heating and cooling unit. The transformer steps high-voltage line power (208/230V primary) down to the 24V signal used by your thermostat, control board, gas valve, and all low-voltage components. When this part fails, the entire control circuit loses power — resulting in a completely unresponsive system, a blank thermostat display, or a unit that won't respond to any heating or cooling calls.

• Specs: 40VA capacity | 208/230V primary input | 24V secondary output | 50/60 Hz rated | OEM part number HT01BD209 | Replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Undersized or off-tolerance aftermarket transformers can sag under peak control-circuit load, causing intermittent lockouts and premature board failures.
• Install difficulty: 2/5 — Disconnect all power at the breaker and verify zero voltage at the transformer terminals with a multimeter before touching any wires. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph the existing wiring before disconnecting — wire colors and terminal labels must match exactly.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for Carrier model PY3PPA036090NB packaged units. Cross-references: HT01BD207, HT01CN232, 4000A46E07AE28, 9076-00. Verify your unit's data plate voltage specifications before ordering. Our parts team is available to confirm fitment prior to purchase — don't guess on a control transformer.