OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY2PPB048115AA

This is the genuine OEM Carrier control transformer (part number HT01BD209), the factory-specified replacement for the Carrier PY2PPB048115AA packaged unit. The control transformer steps down line voltage (208/240V primary) to the 24V secondary required by the low-voltage control circuit. When this transformer fails, the entire control circuit loses power — thermostats, contactors, relays, and safety boards will all go unresponsive. If your unit shows zero activity despite having line power at the disconnect, a failed transformer is one of the first components to test.

• Specs: Primary 208/240V | Secondary 24V | 40VA rating | 50/60 Hz | Weight approx. 1.0 lb | Replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerance specifications. Aftermarket transformers may be under-rated in VA, causing the secondary to sag under load and triggering nuisance tripping of the integrated thermal fuse.
• Install difficulty: 2/5 — Disconnect all power at the unit disconnect and breaker before proceeding. Tools needed: multimeter (verify 0V before touching wires), flathead and Phillips screwdrivers, wire stripper, and wire nuts or spade terminals. Label all low-voltage wiring before disconnecting. Verify 24V output on secondary terminals before buttoning up the panel.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PY2PPB048115AA packaged unit. This part is also a known replacement for units previously using HT01BD207, HT01CN232, and 9076-00. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before installing. Need a fitment check? Our HVAC parts specialists confirm compatibility before you order — call or chat now. In stock and ships today.