OEM Carrier Control Transformer 40VA 208/240V to 24V — HT01BD209 for Model PY2PNB042060NB

This OEM Carrier control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY2PNB042060NB packaged unit. The transformer steps down 208/240V line voltage to the 24V DC signal that powers your thermostat, control board, contactor coils, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the unit won't respond to any call for heat or cool, and a multimeter will show 0V at the 24V secondary terminals. Replacing it is the fastest fix for a completely unresponsive system.

• Specs: 208/240V Primary | 24V Secondary | 40VA rated | 50/60 Hz | Factory OEM part number HT01BD209 | Replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerance specs for your Carrier unit. Generic substitutes often run at reduced VA capacity, causing brown-out conditions on the control board under full load — especially when multiple zone valves or relays energize simultaneously.
• Install difficulty: 2/5 — Turn off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 0V before and 24V after). Photograph or label all low-voltage wiring connections before removing the old transformer.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY2PNB042060NB packaged unit. Also replaces superseded part numbers HT01BD207, HT01CN232, and 9076-00. Verify input voltage on your unit's data plate (208V or 240V) before ordering — this transformer is rated for both. Questions about fitment? Our HVAC parts team verifies compatibility before you order.