OEM Carrier Control Transformer 40VA 208/240V to 24V — HT01BD209 for Model PY3PNA036060NA

The Carrier HT01BD209 is the factory-specified OEM control transformer for the PY3PNA036060NA packaged unit. This transformer steps down 208/240V line voltage to the 24V signal required by your thermostat, control board, contactor coils, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system won't call for heating or cooling, and no fault codes will display. Replacing it with the correct OEM part restores full system communication and operation.

• Specs: 40VA rating | 208/240V primary | 24V secondary | 50/60 Hz | Class 2 control transformer | Replaces HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: OEM transformers are wound to exact VA and impedance specs, protecting downstream boards and contactors from voltage sag or surge. Generic units with loose VA tolerances can cause nuisance tripping, erratic thermostat behavior, or premature control board failure.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before working on low-voltage wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper, needle-nose pliers. Always label all 24V wires before disconnecting. Confirm 0V at transformer terminals before touching leads.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Factory-matched replacement for Carrier model PY3PNA036060NA packaged units. Verify your unit's data plate shows 208/240V primary and 24V secondary before ordering. Cross-references: HT01BD207, HT01CN232, 9076-00, 4000A46E07AE28. Not sure it fits? Our fitment team verifies compatibility before you buy — contact us before placing your order.