OEM Carrier 40VA Control Transformer HT01AW229 for Model PH13NR036000AEAA

This is the factory OEM replacement control transformer for the Carrier PH13NR036000AEAA heat pump system. The transformer steps down line voltage (120V) to the 24V signal voltage required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system won't call for heating or cooling, and no low-voltage components will operate. Replacing it with the correct OEM unit (part number HT01AW229) ensures your system restores factory-accurate voltage output without stressing downstream controls.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | Factory-matched output tolerance for Carrier low-voltage control circuits
• OEM vs Generic: OEM transformers like HT01AW229 are wound and insulated to Carrier's exact VA and voltage specifications. Generic units may output slightly off-spec voltage, causing nuisance trips on sensitive control boards or premature contactor coil wear.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before replacing. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output after installation), wire nuts or spade connectors. Photograph existing wiring before disconnecting the old unit.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our warehouse.

Compatibility: Directly replaces the factory-installed transformer on Carrier model PH13NR036000AEAA heat pump units. Verify your existing transformer's primary voltage (120V) and VA rating (40VA) against your unit's data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — contact us anytime.