OEM Carrier Control Transformer 40VA 208/230V to 24V for Model PH4ZNA060000AA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PH4ZNA060000AA packaged unit. The transformer steps down 208/230V line voltage to the 24V signal used by your thermostat, control board, and low-voltage safety circuit. When this component fails, the entire control circuit goes dead — symptoms include a blank thermostat, no system response to calls for heating or cooling, and a completely unresponsive unit. Replacing it with the correct OEM part restores full low-voltage control functionality immediately.

• Specs: 40VA capacity | 208/230V primary input | 24V secondary output | 50/60 Hz | Part # HT01BD209 | Replaces HT01BD207, HT01CN232, 9076-00
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances specified by Carrier engineering. Undersized or off-tolerance generic units can overdraw the secondary and damage your control board — a far more expensive repair.
• Install difficulty: 2/5 — Shut off all power to the unit before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always photograph or label wiring connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. Ships same business day from our stocked warehouse.

Compatibility: Factory-matched for Carrier PH4ZNA060000AA packaged HVAC equipment. Verify your unit's model and data plate voltage (208/230V) before ordering — a 460V unit requires a different transformer. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order.