OEM Carrier Control Transformer 40VA 208/240V to 24V — HT01BD209 for Model PY3GNA024060AB

This OEM control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GNA024060AB packaged unit. The transformer steps line voltage down from 208/240V to 24V AC, powering the low-voltage control circuit that drives your thermostat, contactor coil, and safety controls. When this transformer fails, the entire control circuit goes dead — the system will not respond to thermostat calls, contactors won't energize, and the unit will appear completely unresponsive. A failed transformer is often accompanied by a tripped or blown 3-amp control fuse.

• Specs: 208/240V Primary | 24V Secondary | 40VA Rating | 50/60 Hz | OEM Part# HT01BD209 | Replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the factory control board. Undersized or off-tolerance aftermarket transformers can overheat, trip thermal cutoffs, or starve the control circuit under peak load — leading to intermittent faults and callbacks.
• Install difficulty: 2/5 — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Label all low-voltage wires before disconnecting the old transformer. Verify secondary voltage reads 24–28V AC after installation before restoring full power.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3GNA024060AB packaged unit. Also compatible with select Bryant and Payne models sharing the same 40VA 208/240V transformer specification — always verify your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy.