OEM Carrier 40VA Control Transformer 208/240V to 24V — Model PY2PNB024060AA

The Carrier HT01BD209 is the factory-specified OEM control transformer for the PY2PNB024060AA packaged unit. Its job is fundamental: step down 208/240V line voltage to the 24V signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this transformer fails — due to a shorted control wire, failed component drawing excess current, or simple age — the entire control circuit goes dead. The result is a system that appears completely unresponsive: no thermostat display response, no contactor pull-in, and no call-for-heat or call-for-cool being processed.

• Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60Hz compatible | Factory-matched OEM tolerances for reliable Class 2 control-circuit operation
• OEM vs Generic: The OEM HT01BD209 is wound to Carrier's exact VA and impedance specs. Undersized or off-tolerance aftermarket transformers can overheat, trip thermal protection, or deliver unstable 24V — causing intermittent faults that are difficult to diagnose.
• Install difficulty: 2/5 — Shut off all power at the disconnect and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always photograph existing wiring connections before removal. Inspect all 24V control wiring for shorts before energizing the new transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY2PNB024060AA. Verify primary voltage (208V or 240V) matches your supply before ordering — this transformer supports both taps. Not sure it fits? Our HVAC parts specialists verify fitment before you buy. Order now and get same-day shipping on in-stock parts.