OEM Carrier Control Circuit Transformer 50VA 120/240V–24V for Model UPFLOW100CU12A

This OEM Carrier transformer (part #P201-35150) is the factory-specified step-down transformer for the Carrier UPFLOW100CU12A air handler. Its sole job is to convert high-voltage line power (120, 208, or 240 VAC) down to a safe 12 or 24 VAC to power your system's control board, thermostat, and all low-voltage control circuitry. When this transformer fails, nothing works — the thermostat goes dark, the system won't respond to calls for heat or cooling, and no fault codes are generated because the control board itself has lost power.

• Specs: 50VA rating | Primary: 120 / 208 / 240 VAC | Secondary: 12 / 24 VAC | Single-phase | 50/60 Hz | Screw terminals | 4-wire (White=Common, Black=120V, Red=208V, Orange=240V)
• OEM vs Generic: This OEM Totaline/Carrier unit is factory-wound to exact VA and voltage tolerances. Undersized or off-tolerance generic transformers run hot, trip thermal cutoffs prematurely, and can damage sensitive control boards — a risk not worth taking on a 50VA part.
• Install Difficulty: 2/5 — Shut off power at the breaker and verify zero voltage before disconnecting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts. Photograph existing wire routing before removal. Always tap to the correct primary voltage leg matching your supply.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for the Carrier UPFLOW100CU12A air handler. Replaces legacy Carrier part number 35150. Verify your unit's supply voltage before selecting primary tap (120V, 208V, or 240V). Contact our team for fitment confirmation before ordering — we verify compatibility at no charge.