OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PPA060115AB

This genuine OEM control transformer (part# HT01BD209) is the factory-specified replacement for the Carrier PY3PPA060115AB packaged HVAC unit. The transformer steps down line voltage from 208/240V to the 24V DC signal that powers your thermostat, control board, contactors, and all low-voltage components. When this transformer fails, the entire control circuit goes dark — you'll typically see a blank thermostat display, no response to any thermostat call, or a tripped secondary fuse with no obvious short in the wiring.

• Specs: 40VA capacity | 208/240V primary input | 24V secondary output | 50/60Hz rated | Foot-mount configuration | OEM part# HT01BD209
• OEM vs Generic: This is a genuine Carrier OEM transformer wound and tested to factory tolerances. Generic aftermarket units often underperform under sustained load, causing nuisance voltage drops that trip boards and contactors prematurely. OEM is the only choice when control circuit stability matters.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all 24V wiring before disconnecting the old unit. Verify input voltage at the primary before powering up. Always check for a shorted secondary load before replacing — a shorted wiring harness will immediately blow the new transformer.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse. Replaces obsolete part numbers HT01BD207, HT01CN232, and 9076-00.

Compatibility: Directly fits Carrier model PY3PPA060115AB packaged HVAC units. Cross-references: HT01BD207, HT01CN232, 9076-00. Confirm input voltage on your unit's data plate (208V or 240V) before ordering — this transformer supports both. Need fitment help? Our HVAC parts specialists verify compatibility before you order. In stock — ships today.