OEM Carrier 40VA Control Transformer P201-35150 for Model UPFLOW120HCU12A

This OEM control transformer (part# P201-35150) is the factory-specified replacement for the Carrier UPFLOW120HCU12A upflow gas furnace. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When the transformer fails, the entire control system goes dead: the thermostat loses power, nothing calls for heat or cooling, and the furnace will not respond to any input. A shorted transformer will often trip or blow the low-voltage fuse repeatedly.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory-matched OEM tolerances | Direct plug-in replacement for P201-35150
• OEM vs Generic: This is the genuine OEM Carrier transformer — built to exact VA rating and insulation class for the UPFLOW120HCU12A. Generic transformers may under-rate VA capacity, causing overheating and repeated fuse failures under normal load.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, multimeter (to verify 24V output after install). Photograph wiring connections before disconnecting. Reconnect primary (120V) leads and secondary (24V) leads to matching terminals.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier UPFLOW120HCU12A upflow gas furnace. Verify primary voltage (120V), secondary voltage (24V), and VA rating on your existing transformer's label before ordering to confirm fitment. Have questions about compatibility? Our HVAC parts specialists verify fitment before you order — reach out before purchasing.