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OEM Carrier Transformer 40VA 120V-24V for FA4ANF018005AGAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FA4ANF018005AGAA

SKU: CARRIE-FA4ANF018005AGAA-TRANSFORMER-HT01CN236 Brand: Carrier
✓ Guaranteed to fit FA4ANF018005AGAA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01CN236 for Model FA4ANF018005AGAA

This OEM Carrier control transformer (part number HT01CN236) is the factory-specified replacement for the FA4ANF018005AGAA air handler unit. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, control board, and all 24V relay coils. When this transformer fails, the entire control circuit goes dead: the thermostat shows no power, the system won't respond to any calls for heating or cooling, and nothing operates. It is often the first component to inspect when a unit appears completely unresponsive despite confirmed line voltage at the unit.

  • Specs: Input 120V AC | Output 24V AC | 40VA rating | OEM part number HT01CN236 | Factory-matched construction for reliable low-voltage output
  • OEM vs Generic: This is a genuine OEM Carrier transformer built to exact factory VA and voltage tolerances. Generic transformers may deliver inconsistent output voltage, causing nuisance lockouts, board resets, or premature control board failure — making OEM the smart long-term investment.
  • Install difficulty: 2/5 — Disconnect all power to the air handler before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to confirm 24V output after installation. Label or photograph all low-voltage wiring connections before removing the original transformer.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed and factory-specified for the Carrier FA4ANF018005AGAA air handler. Verify your existing transformer's VA rating and primary/secondary voltage on the unit data plate before ordering to ensure a correct fit. Our parts specialists are available to confirm compatibility before you buy — same-day shipping means your repair won't wait.

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 FA4ANF018005AGAA?
Yes. This is the factory-specified OEM transformer for the Carrier FA4ANF018005AGAA. 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 FA4ANF018005AGAA?
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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