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OEM Carrier Transformer 50VA 120/240-24V for UPFLOW125CU12A
Carrier

OEM Carrier Transformer 50VA 120/240-24V for UPFLOW125CU12A

SKU: CARRIE-UPFLOW125CU12A-TRANSFORMER-P201-35150 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 50VA Control Transformer 120/208/240–24V for Model UPFLOW125CU12A

This OEM step-down transformer is the factory-specified replacement for the Carrier UPFLOW125CU12A upflow furnace. It converts incoming line voltage (120/208/240 VAC) to the 24 VAC needed to power the system's control board, thermostat circuit, and all low-voltage components. When this transformer fails, the entire control circuit loses power — resulting in a completely unresponsive furnace, a blower that won't start, or a system that trips the low-voltage fuse repeatedly. Replacing the transformer is one of the most cost-effective repairs in the furnace control circuit.

  • Specs: 50 VA rating | Primary: 120/208/240 VAC multi-tap | Secondary: 12/24 VAC | Single phase | 60 Hz | CSA listed | Factory part number P201-35150
  • OEM vs Generic: OEM transformers are wound and potted to exact Carrier tolerances, ensuring stable 24V output under load. Generic units often deliver inconsistent secondary voltage, causing nuisance lockouts, board resets, or premature control board failure.
  • Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Label and photograph all wiring connections before removal. Typical install time: 20–30 minutes.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier UPFLOW125CU12A upflow gas furnace. Always verify the part number printed on your existing transformer before ordering to confirm the correct VA rating and voltage taps match your unit's wiring configuration. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions.

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 UPFLOW125CU12A?
Yes. This is the factory-specified OEM transformer for the Carrier UPFLOW125CU12A. 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 UPFLOW125CU12A?
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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