OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GNAA48130AA

This OEM Carrier transformer (part #HT01BD209) is the factory-specified control voltage transformer for the Carrier PY3GNAA48130AA packaged unit. Its job is to step down line voltage from 208/240V to the 24V AC signal that powers your thermostat, control board, and every low-voltage relay in the system. When this transformer fails, the entire control circuit loses power — resulting in a blank thermostat display, a system that will not respond to any call for heating or cooling, or a tripped secondary fuse with no obvious cause. Replacing it with the correct OEM unit restores factory-rated output immediately.

• Specs: Input: 208/240V | Output: 24V AC | Power Rating: 40VA | Frequency: 50/60Hz | OEM Part #: HT01BD209
• OEM vs Generic: OEM transformers are wound to exact factory VA tolerance, ensuring stable 24V output under full control-circuit load. Generic units often underperform at rated VA, causing intermittent lockouts or premature secondary fuse failures.
• Install Difficulty: 2/5 — Disconnect power at the breaker and confirm zero voltage with a multimeter before touching any wiring. Note primary and secondary wire connections before removal. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Total job typically under 30 minutes for an experienced technician.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-matched replacement for Carrier model PY3GNAA48130AA. Always verify your unit's data plate voltage configuration (208V or 240V primary tap) matches before installation. Have a question about fitment? Our HVAC parts specialists verify compatibility before every order — contact us today and get your system back online fast.