OEM Carrier Control Transformer 40VA 208/230V — HT01BD209 for Model PY3PPA048130AA

This OEM Carrier control transformer (part# HT01BD209) is the factory-specified replacement for the Carrier PY3PPA048130AA packaged unit. The transformer steps down line voltage (208/230V primary) to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this part fails, the entire control circuit goes dark — the thermostat shows no response, the system won't call for heating or cooling, and the unit sits completely unresponsive despite line voltage being present at the unit.

• Specs: 208/230V Primary | 24V Secondary | 40VA Rating | 50/60 Hz | Replaces HT01BD207, HT01CN232 & 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer built to exact factory VA and voltage tolerances. Generic equivalents may run at reduced VA capacity, causing nuisance tripping, overheating, or premature control board failure under peak demand loads.
• Install Difficulty: 2/5 — Shut off all power at the disconnect and breaker before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always photograph the existing wiring before disconnecting terminals. Verify 24V output with a multimeter after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3PPA048130AA packaged unit. Cross-references include HT01BD207, HT01CN232, and 9076-00. Verify your unit's data plate voltage and VA requirements before ordering. Our team is available to confirm fitment — reach out before you buy if you have any questions.