OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PNA060115NB

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA060115NB packaged unit. The transformer steps down 208/240V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any calls for heating or cooling, and you may blow a fuse repeatedly. Replacing it with the correct OEM unit restores the factory-spec voltage supply your system depends on.

• Specs: 40VA rating | 208/240V primary | 24V secondary | 50/60Hz | Class 2 control transformer | Direct replacement for HT01BD207, HT01CN232, and 9076-00
• OEM vs Generic: OEM transformers are wound and potted to Carrier's exact VA and voltage tolerances. Undersized or off-spec generics can overheat under load, trip thermal cutoffs prematurely, and damage downstream control boards — a far more expensive repair.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Note wire colors and terminal markings before disconnecting the old unit. Verify 24V output with a multimeter before restoring full system power.
• Warranty: 1-year OEM factory warranty included. Ships same business day from our warehouse — order by 3PM local time.

Compatibility: Engineered for the Carrier PY3PNA060115NB packaged gas/electric unit. Confirm your unit's data plate lists 208/240V single-phase power supply before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.