OEM Carrier Control Transformer 40VA 208/230V to 24V — HT01BD209 for Model PY4GPAA48130AA

This genuine OEM Carrier control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY4GPAA48130AA packaged unit. The transformer steps down line voltage from 208/230V to a stable 24V output, powering the entire low-voltage control circuit — including the thermostat, contactor coil, control board, and zone valves. When the transformer fails, the result is often total system lockout: a blank thermostat, no response from the unit, or a blown low-voltage fuse caused by a shorted secondary circuit. Replacing it restores full system communication and control.

• Specs: 208/230V primary | 24V secondary | 40VA rating | 50/60 Hz | Replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: This is the genuine Carrier OEM part — factory-wound to exact VA and voltage tolerances. Undersized or off-tolerance aftermarket transformers can overheat, trip thermal cutoffs, or fail to supply adequate current to contactor coils, causing nuisance lockouts.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output post-install and confirm no secondary short before energizing). Label or photograph all wiring connections prior to removal.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GPAA48130AA packaged unit. Cross-references OEM part numbers HT01BD207, HT01CN232, and 9076-00. Always confirm your unit's data plate voltage before ordering. Our fitment team is available to verify compatibility before you buy — order with confidence and get your system back online today.