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OEM Carrier Transformer 120V–24V 40VA for YAC1840YAC101K
Carrier

OEM Carrier Transformer 120V–24V 40VA for YAC1840YAC101K

SKU: CARRIE-YAC1840YAC101K-TRANSFORMER-P201-35150 Brand: Carrier
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OEM Carrier Transformer 120V–24V 40VA for Model YAC1840YAC101K

This OEM replacement transformer (Part # P201-35150) is the factory-specified step-down transformer for the Carrier YAC1840YAC101K packaged unit. Its job is critical but simple: it converts 120V line voltage down to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, absolutely nothing in the system responds. You'll see a blank thermostat screen, no cooling calls answered, and often a tripped fuse on the secondary side.

  • Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: P201-35150 | Factory-matched insulation class and wire gauge
  • OEM vs Generic: This is the exact factory-spec OEM transformer. Generic transformers frequently ship with under-rated VA capacity, causing thermal shutdowns under load and repeat fuse failures within months.
  • Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Always verify 24V output on the secondary terminals before reassembling the control panel.
  • Warranty: 1-year OEM factory warranty. In stock and ships the same business day from our warehouse.

Compatibility: Designed for the Carrier YAC1840YAC101K packaged unit. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. Not sure if this is your part? Our HVAC fitment team is standing by — order with confidence.

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 YAC1840YAC101K?
Yes. This is the factory-specified OEM transformer for the Carrier YAC1840YAC101K. 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 YAC1840YAC101K?
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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