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OEM Carrier Transformer 40VA 120V/24V for FA4ANF030005AFAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FA4ANF030005AFAA

SKU: CARRIE-FA4ANF030005AFAA-TRANSFORMER-HT01CN236 Brand: Carrier
✓ Guaranteed to fit FA4ANF030005AFAA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer for Model FA4ANF030005AFAA Air Handler

This is the factory OEM replacement transformer (part# HT01CN236) for the Carrier FA4ANF030005AFAA air handler. The control transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: your thermostat goes blank, the system refuses to respond to any call for heating or cooling, and you may blow the 3A fuse on the board repeatedly. Replacing this component is typically the fastest path to restoring full system operation.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched for Carrier FA4ANF030005AFAA air handlers
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control boards. Undersized or off-tolerance generic units can cause nuisance fuse failures, erratic thermostat behavior, and premature control board damage — costing far more in downstream repairs.
  • Install difficulty: 2/5 — Always disconnect power at the breaker before beginning work. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring before disconnecting terminals. Verify incoming line voltage with a multimeter before condemning the transformer.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Engineered and specified for the Carrier FA4ANF030005AFAA fan coil/air handler unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Need help verifying fitment? Our HVAC parts team will confirm compatibility before your order ships — same day.

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 FA4ANF030005AFAA?
Yes. This is the factory-specified OEM transformer for the Carrier FA4ANF030005AFAA. 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 FA4ANF030005AFAA?
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
HVAC Parts Specialist — Online