OEM Carrier 40VA Control Transformer HT01BD209 for Model PY2PPB060090AA

This OEM control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY2PPB060090AA packaged unit. The transformer steps down 120V line voltage to the 24V signal required by the thermostat, control board, contactor coil, and all low-voltage control circuits. When it fails, the entire control system goes dark — no thermostat response, no contactor pull-in, and no call-for-heat or call-for-cool activity. A failed transformer is one of the most common causes of a completely unresponsive HVAC system.

• Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | Frequency: 60 Hz | Factory OEM matched to Carrier PY2PPB060090AA wiring harness
• OEM vs Generic: This is a genuine Carrier OEM transformer built to exact VA and impedance specifications. Generic aftermarket transformers often carry inaccurate VA ratings, which can overheat under full control-circuit load and cause nuisance tripping or secondary component damage.
• Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: multimeter, screwdriver, wire stripper. Always verify 24V output at secondary terminals before reconnecting control wiring. Tip: check for a short in the 24V circuit before installing the new transformer to prevent repeat failure.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PY2PPB060090AA packaged unit. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating on the unit data plate or original part label before ordering. Our technical team is available to confirm fitment — contact us before you buy if you have any questions.