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OEM Carrier Transformer 40VA 120V/24V for KHAIC0101AAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for KHAIC0101AAA

SKU: CARRIE-KHAIC0101AAA-TRANSFORMER-HT01AW229 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V/24V for Model KHAIC0101AAA

This is the factory OEM replacement transformer (part number HT01AW229) for the Carrier KHAIC0101AAA. The control circuit transformer steps down line voltage (120V) to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching components. When this transformer fails, the entire control circuit goes dead — your thermostat will go blank, the system will not respond to any call for heating or cooling, and nothing will happen when you cycle the breaker. It is often the first component to inspect when a system shows absolutely no signs of life.

  • Specs: Input 120VAC | Output 24VAC | 40VA rating | OEM part number HT01AW229 | Factory-matched for Carrier KHAIC0101AAA
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the control board. Undersized or off-tolerance generic units can fail prematurely or cause erratic control board behavior, risking damage to downstream components.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 24VAC output on the secondary terminals before reconnecting control wiring. Always label low-voltage wires before removing.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier KHAIC0101AAA. Verify your existing transformer's input voltage, output voltage, and VA rating on the unit data plate or existing component label before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system back online 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 $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 KHAIC0101AAA?
Yes. This is the factory-specified OEM transformer for the Carrier KHAIC0101AAA. 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 KHAIC0101AAA?
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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