OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY2PNB048115AB

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY2PNB048115AB packaged unit. The transformer steps down the 208/240V line voltage to the 24V signal required to power the control board, thermostat circuit, and all low-voltage safety controls. When it fails, the entire low-voltage control circuit loses power — the system will appear completely dead, with no thermostat response, no contactor pull-in, and no inducer or fan operation. Replacing a failed transformer is one of the most reliable ways to restore full system function.

• Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60Hz | Factory-matched OEM tolerance for consistent control voltage
• OEM vs Generic: OEM transformers are wound and rated to exact Carrier factory specifications. Aftermarket units frequently run at marginal VA output, causing nuisance tripping of the internal thermal fuse and premature control board damage.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output post-install), wire nuts or quick-connects. Always label low-voltage wiring before removal and verify polarity on secondary terminals.
• Warranty: 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement transformer for the Carrier PY2PNB048115AB packaged unit. Verify your existing transformer's voltage and VA ratings against your unit data plate before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy.