OEM Carrier Control Transformer 208/240V to 24V 40VA — HT01BD209 for Model PY3PPA060115NB

This OEM Carrier transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PPA060115NB packaged unit. The transformer steps down the 208/240V line voltage to the 24V DC signal that powers your thermostat, control board, and all low-voltage components. When it fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any call for heating or cooling, and you may blow a 3A fuse repeatedly. This is one of the first components to check during a no-response, no-power diagnostic.

• Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60 Hz | Direct OEM replacement — factory-matched to PY3PPA060115NB
• OEM vs Generic: OEM transformers are wound to exact Carrier VA and voltage tolerances, protecting your control board from under- or over-voltage damage. Generic units frequently run outside tolerance, risking downstream component failure.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph or label all low-voltage wiring connections before disconnecting. Verify 24V output with a multimeter after installation before restoring full power.
• Warranty: 1-year OEM factory warranty. Also replaces superseded part number HT01CN232. Ships same business day from our warehouse.

Compatibility: Fits Carrier model PY3PPA060115NB packaged units. Cross-references: HT01CN232, HT01CN233. Verify your unit's data plate shows a 208/240V primary control circuit before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — call or chat today and we'll ship it out the same day.