OEM Carrier 40VA Control Transformer for Model PY3PNA036060AA

This OEM control transformer (part# HT01BD209) is the factory-specified replacement for the Carrier PY3PNA036060AA packaged unit. The transformer steps down line voltage (120V) to the 24V AC signal used by your thermostat, control board, contactor coils, and all low-voltage safety circuits. When it fails, the entire control circuit goes dark — no thermostat response, no heat or cooling, and no fault codes — because the brain of the system simply has no power.

• Specs: 120V primary | 24V secondary | 40VA rating | Factory-matched OEM windings and insulation class
• OEM vs Generic: The OEM HT01BD209 is wound and tested to Carrier's exact VA and voltage specifications. Undersized or off-tolerance generic transformers can overheat, trip internal fuses prematurely, or fail to sustain voltage under full control-circuit load — shortening system life.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to confirm 24V output post-install. Always photograph existing wiring before disconnecting terminals.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Fits Carrier model PY3PNA036060AA packaged unit. Verify primary voltage and VA rating on your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you order — contact us anytime.