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OEM Carrier Transformer 50VA 120/240-24V — UPFLOW125FAUHAU14A
Carrier

OEM Carrier Transformer 50VA 120/240-24V — UPFLOW125FAUHAU14A

SKU: CARRIE-UPFLOW125FAUHAU14A-TRANSFORMER-P201-35150 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 50VA 120/208/240V–12/24V for Model UPFLOW125FAUHAU14A

This factory-original OEM control transformer (part# P201-35150) is the direct replacement for the Carrier UPFLOW125FAUHAU14A upflow gas furnace. The transformer steps down line voltage from 120/208/240 VAC to a safe 12/24 VAC output, powering the furnace's control board, thermostat circuit, and all low-voltage components. When the transformer fails, the entire control circuit goes dark — symptoms include a completely unresponsive thermostat, no system response to calls for heat, or a tripped low-voltage fuse caused by a shorted secondary winding.

  • Specs: 50VA 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 Carrier Factory Authorized / Totaline-branded OEM unit, engineered to exact VA and voltage tolerances for your furnace's control board. Off-brand transformers with loose tolerances can under-deliver current to the control board, causing nuisance lockouts and premature board failure.
  • Install difficulty: 3/5 — Shut off all power at the breaker before beginning. Tools needed: Phillips screwdriver, flathead screwdriver, multimeter, wire stripper. Photograph all primary and secondary wire connections before disconnecting. Confirm fuse integrity on the secondary circuit before energizing. If the replacement transformer also blows a fuse, diagnose for a downstream short before proceeding.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Factory-specified for the Carrier UPFLOW125FAUHAU14A upflow gas furnace. Also cross-references as Totaline P201-35150 (HCTY156D0LS11102). Verify your data plate voltage configuration (120V or 240V primary tap) before ordering. Not sure if this is the right part? Contact our HVAC parts specialists — we verify fitment before you buy and ship same day.

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 OEM Carrier Transformer 50VA 120/240-24V — UPFLOW125FAUHAU14A?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Transformer 50VA 120/240-24V — UPFLOW125FAUHAU14A. 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 OEM Carrier Transformer 50VA 120/240-24V — UPFLOW125FAUHAU14A?
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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