OEM Carrier 40VA Control Transformer P201-35150 for Model UPFLOW125FAU14125

This OEM control transformer is the factory-specified replacement for the Carrier UPFLOW125FAU14125 upflow gas furnace. The transformer steps down line voltage (120V) to the 24V AC signal that powers the control board, thermostat circuit, and all low-voltage safety controls. When it fails, the entire control circuit goes dark — symptoms include a completely unresponsive thermostat, no furnace activity whatsoever, or a tripped fuse on the control board caused by a secondary short.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched to Carrier UPFLOW125FAU14125 control circuit | OEM part number P201-35150
• OEM vs Generic: This is a genuine OEM Carrier transformer engineered to exact VA, voltage, and mounting specifications. Generic transformers may be under-rated in VA output, leading to nuisance fuse trips and premature control board damage under high-demand switching loads.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 24V output after install). Always note wire positions before disconnecting. Check and replace the 3A or 5A control board fuse if blown.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model UPFLOW125FAU14125 upflow furnaces. Always verify your unit's data plate voltage requirements before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — reach out before you order.