OEM Carrier Control Transformer 40VA for Model CH13NA04800GACAA (HT01AW229)

This is the OEM factory-specified control transformer for the Carrier CH13NA04800GACAA split-system air conditioner. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and any accessory controls. When this transformer fails, nothing in the system responds: the thermostat goes blank, the contactor won't pull in, and the unit sits completely dead despite having line voltage at the disconnect. It is one of the most frequently overlooked components during a no-call diagnostic.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01AW229 | Factory-matched electrical specifications for the CH13NA04800GACAA control board circuit
• OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA rating and thermal protection standards. Undersized or generic transformers can saturate under load, trip internal thermal cutoffs prematurely, and shorten the lifespan of connected control boards and contactors.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wires before removing the old transformer. A blown transformer can indicate a downstream short — check wiring and contactor coil before energizing.
• Warranty: 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier CH13NA04800GACAA 4-ton split-system condenser. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering to confirm fitment. Our parts specialists are available to verify compatibility before you buy — no guesswork, no wasted returns.