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OEM Carrier Transformer 40VA 120/24V for FA4ANF018000AGAA
Carrier

OEM Carrier Transformer 40VA 120/24V for FA4ANF018000AGAA

SKU: CARRIE-FA4ANF018000AGAA-TRANSFORMER-HT01CN236 Brand: Carrier
✓ Guaranteed to fit FA4ANF018000AGAA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V to 24V for Model FA4ANF018000AGAA

This OEM replacement transformer (part# HT01CN236) is the factory-specified control circuit transformer for the Carrier FA4ANF018000AGAA air handler. The transformer steps down 120V line voltage to 24V AC to power the control board, thermostat, and all low-voltage system controls. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to calls for heating or cooling, and no fault codes are displayed. It is often the first component to suspect when the system appears completely unresponsive with no visible error codes.

  • Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Mounts directly to original bracket with no modification
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage tolerance specifications, ensuring stable 24V output under full load. Undersized or off-tolerance generic transformers can cause intermittent lockouts, nuisance tripping, and premature control board failure.
  • Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Test secondary output voltage after installation to confirm 24V before restoring full power. Photograph all wiring connections prior to removal.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FA4ANF018000AGAA air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering to ensure an exact match. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork required.

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 FA4ANF018000AGAA?
Yes. This is the factory-specified OEM transformer for the Carrier FA4ANF018000AGAA. 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 FA4ANF018000AGAA?
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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