OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY2PNB048090AB

This OEM control transformer (part# HT01BD209) is the factory-specified replacement for the Carrier PY2PNB048090AB packaged unit. The transformer steps down 208/240V line voltage to the 24V signal that powers your thermostat, control board, gas valve, and every other low-voltage component in the system. When it fails — due to a short circuit, overloaded secondary, or age-related winding degradation — absolutely nothing in the control circuit will respond. The thermostat goes blank, the unit won't call for heating or cooling, and diagnostics often return no fault codes at all because there's no power to run them.

• Specs: 40VA capacity | 208/240V primary | 24V secondary | 50/60Hz rated | OEM part# HT01BD209 | Also crosses to HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: This is the genuine Carrier OEM transformer — wound to exact VA and voltage tolerance specs. Generic substitutes often carry higher internal resistance and tighter thermal limits, increasing the risk of nuisance trips or secondary overload under peak demand.
• Install difficulty: 2/5 — Shut off all power to the unit before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to confirm 24V output post-install). Photograph all wiring connections before disconnecting. The transformer mounts with two screws; note wire color positions on both primary and secondary terminals.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — order by 3PM local time for same-day dispatch.

Compatibility: Engineered for the Carrier PY2PNB048090AB packaged unit. Verify your model and serial number before ordering. Replaces legacy part numbers HT01BD207, HT01CN232, and 9076-00. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork.