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OEM Carrier Transformer 50VA 120/240-24V for UPFLOW125FAU12A
Carrier

OEM Carrier Transformer 50VA 120/240-24V for UPFLOW125FAU12A

SKU: CARRIE-UPFLOW125FAU12A-TRANSFORMER-P201-35150 Brand: Carrier

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Control Transformer 50VA 120/208/240V–12/24V for Model UPFLOW125FAU12A

The Carrier P201-35150 is the factory-specified step-down transformer for the UPFLOW125FAU12A upflow gas furnace. It converts incoming line voltage (120/208/240 VAC) down to a safe 12/24 VAC to power the furnace's control board, thermostat circuit, and all low-voltage components. When this transformer fails, the entire low-voltage control circuit goes dead — resulting in a furnace that won't respond to the thermostat, a completely dark control board, or tripped secondary fuses with no other apparent cause.

  • Specs: 50 VA rating | Primary: 120/208/240 VAC | Secondary: 12/24 VAC | Single-phase | 60 Hz | CSA listed | Dimensions: 3.8″L × 3.1″W × 2.2″H
  • OEM vs Generic: This is a genuine Carrier/Totaline factory part (P201-35150), wound to exact VA and voltage tolerances. Generic transformers often run outside rated VA, causing nuisance fuse failures and shortened control board life on the UPFLOW125FAU12A.
  • Install difficulty: 2/5 — Shut off power at the breaker and verify zero voltage before disconnecting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all wire connections before removal. The transformer mounts inside the furnace cabinet and connects to the control board low-voltage harness.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — order by 3 PM local time.

Compatibility: Direct OEM replacement for Carrier model UPFLOW125FAU12A upflow gas furnaces. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — contact us anytime.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $75
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Transformer fit my Carrier UPFLOW125FAU12A?
Yes. This is the factory-specified OEM transformer for the Carrier UPFLOW125FAU12A. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the transformer on my Carrier UPFLOW125FAU12A?
Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.
My thermostat has no power. What failed?
Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.
Is this transformer compatible with Bryant or Payne too?
Many Carrier parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Carrier transformer?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
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