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OEM Carrier Transformer 40VA 120V/24V for CH13NA03700GACAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for CH13NA03700GACAA

SKU: CARRIE-CH13NA03700GACAA-TRANSFORMER-HT01AW229 Brand: Carrier
✓ Guaranteed to fit CH13NA03700GACAA — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V to 24V for Model CH13NA03700GACAA

This OEM replacement transformer (part number HT01AW229) is the factory-specified control circuit transformer for the Carrier CH13NA03700GACAA split-system air conditioner. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, contactor coil, and all low-voltage control circuits. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system will not respond to any calls for cooling or heating, and no components will energize. A failed transformer is often mistaken for a bad control board or thermostat, so always verify 24V output at the secondary terminals before replacing more expensive components.

  • Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01AW229 | Replaces factory-installed unit exactly
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class, ensuring reliable 24V output under full control circuit load. Generic transformers may be under-rated in VA, causing overheating, nuisance tripping of the internal thermal fuse, and premature failure.
  • Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wire connections before removal and verify 24V output after installation before closing the cabinet.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model CH13NA03700GACAA. Verify your unit's data plate confirms 120V/24V control circuit configuration before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — order with confidence 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 CH13NA03700GACAA?
Yes. This is the factory-specified OEM transformer for the Carrier CH13NA03700GACAA. 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 CH13NA03700GACAA?
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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