OEM Carrier Control Transformer 40VA 208/230V — HT01BD209 for Model PY3PNA048130AA

This genuine OEM Carrier control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3PNA048130AA packaged unit. The transformer steps down 208/230V line voltage to the 24V signal required to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the result is complete loss of control voltage: the thermostat goes blank, nothing responds to calls for heating or cooling, and no diagnostic codes are generated because the board itself has no power. If your system is completely unresponsive and you've confirmed 240V at the disconnect but zero voltage at the 24V secondary terminals, this transformer is your most likely culprit.

• Specs: 40VA power rating | 208/230V primary voltage | 24V secondary voltage | 50/60Hz | OEM part number HT01BD209 | Cross-references: HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances for the PY3PNA048130AA. Generic transformers may be rated nominally at 40VA but under-perform under load, causing voltage sag that nuisance-trips contactors and damages control boards over time.
• Install difficulty: 2/5 — Shut off power at the disconnect and verify zero voltage before touching any wires. Tools needed: flathead and Phillips screwdrivers, multimeter, wire labels or tape. Photograph all wire connections before disconnecting. The transformer typically mounts to the control panel with two screws; primary and secondary leads connect via spade or screw terminals.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Orders ship same business day from our warehouse when placed before cutoff.

Compatibility: Designed for the Carrier PY3PNA048130AA packaged unit. Also cross-references OEM part numbers HT01BD207, HT01CN232, and 9076-00. Always verify input voltage (208V or 230V) at your unit's data plate before ordering. Our technical team is available to confirm fitment — reach out before you order if you have any questions.