OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GNA036060AA

This OEM control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3GNA036060AA. The transformer steps down line voltage from 208/240V to a safe 24V signal that powers the low-voltage control circuit — including your thermostat, contactor coil, control board, and safety switches. When this transformer fails, the entire control circuit goes dark: the thermostat loses power, the system won't respond to any command, and you may detect a faint burning smell or a visibly scorched transformer body. It is one of the most critical components in the unit, and an OEM replacement ensures the entire system returns to factory-spec operation immediately.

• Specs: 208/240V primary | 24V secondary | 40VA rated | 50/60Hz compatible | Replaces HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: OEM transformers are wound to exact Carrier factory tolerances. Generic units may under-deliver VA capacity under load, causing nuisance tripping of the thermal overload, intermittent thermostat dropouts, or premature failure — especially in multi-stage systems with higher control circuit demand.
• Install difficulty: 2/5 — Shut off all power to the unit at the disconnect and breaker before beginning. Tools needed: multimeter (to confirm 0V before touching wires), flathead and Phillips screwdrivers, wire stripper, and spade connectors. Photograph all existing wiring before disconnecting. Mount securely and verify 24V output before reassembling the cabinet.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Direct OEM fit for Carrier model PY3GNA036060AA. Verify your unit's data plate shows 208/240V primary voltage before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before every order — reach out before you buy.