OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY1PJB048130ABAA

This OEM Carrier control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY1PJB048130ABAA packaged unit. The transformer steps down line voltage (208/240V) to the 24V used by the low-voltage control circuit — powering the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system will not respond to any call for heating or cooling, and in some cases a tripped 3-amp fuse is the only visible symptom.

• Specs: 40VA rated | Primary: 208/240V, 50/60 Hz | Secondary: 24V | Direct OEM replacement for HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: The OEM HT01BD209 is factory-wound to exact VA and impedance specifications. Undersized or off-spec aftermarket transformers can overheat, nuisance-trip the internal thermal fuse, or deliver unstable 24V that causes intermittent lockouts and board damage.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring before disconnecting. Always replace the 3-amp control fuse at the same time to rule out downstream shorts.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-matched for Carrier model PY1PJB048130ABAA. Verify your existing transformer's primary voltage (208V or 240V) and VA rating on the unit data plate before ordering. Cross-references include HT01BD207, HT01CN232, and 9076-00. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — order with confidence.