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OEM Carrier Transformer 50VA 120/240-24V for YAC42110YACX102AK
Carrier

OEM Carrier Transformer 50VA 120/240-24V for YAC42110YACX102AK

SKU: CARRIE-YAC42110YACX102AK-TRANSFORMER-P201-35150 Brand: Carrier
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OEM Carrier Transformer 50VA 120/208/240-24V for Model YAC42110YACX102AK

This is the factory OEM replacement step-down transformer (part number P201-35150) for the Carrier YAC42110YACX102AK HVAC system. The transformer converts incoming line voltage (120, 208, or 240 VAC) down to a safe 12/24 VAC used to power the system's control board, thermostat, and all low-voltage components. When this transformer fails, the entire control circuit loses power — resulting in a completely unresponsive system, a blank thermostat, or a unit that will not heat or cool under any conditions. Do not attempt to run the system with a failed transformer, as secondary burnout can cascade into control board damage.

  • Specs: 50 VA rating | Primary voltage: 120/208/240 VAC | Secondary voltage: 12/24 VAC | Single phase | 60 Hz | CSA listed | Single-phase control circuit application
  • OEM vs Generic: OEM transformers are wound to exact VA and impedance tolerances required by the Carrier factory. Undersized or off-spec generic transformers can overheat, trip internal thermal cutoffs prematurely, or deliver unstable secondary voltage that causes nuisance lockouts and control board failures.
  • Install difficulty: 3/5 — Line voltage is present at the primary terminals; always shut off the unit's disconnect and verify zero voltage with a multimeter before wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire nuts or terminals. Photograph all wiring before disconnecting. Secondary circuit (24V) side is low-risk once line power is off.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the factory-specified transformer for Carrier model YAC42110YACX102AK. Cross-references include Totaline P201-35150 and HCTY156D0LS11102. Verify your unit's primary voltage configuration (120V or 240V) matches your wiring before installation. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — order now and ship today!

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 $99
  • 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 YAC42110YACX102AK?
Yes. This is the factory-specified OEM transformer for the Carrier YAC42110YACX102AK. 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 YAC42110YACX102AK?
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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