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OEM Carrier Transformer 40VA 120V/24V for FF1DNA024005AAAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FF1DNA024005AAAA

SKU: CARRIE-FF1DNA024005AAAA-TRANSFORMER-HT01CN236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V to 24V for Model FF1DNA024005AAAA

This OEM control circuit transformer (Carrier part number HT01CN236) is the factory-specified replacement for the Carrier FF1DNA024005AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching circuits. When this transformer fails, the entire control circuit goes dead — your thermostat loses power, the system won't respond to any commands, and no error codes are displayed because the board itself has no power to run diagnostics.

  • Specs: 40VA rated | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01CN236 | Factory-matched impedance and VA rating for the FF1DNA024005AAAA control circuit
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances specified by Carrier engineering. Undersized or off-tolerance generic transformers can overheat, trip their internal thermal fuse prematurely, or deliver unstable 24V that causes erratic board behavior and nuisance lockouts.
  • Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching terminals). Photograph all low-voltage wiring connections before removal. The transformer mounts to the cabinet with one or two screws and uses push-on or screw-terminal connections.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier FF1DNA024005AAAA fan coil unit. Confirm your unit's data plate shows 120V primary supply and 24V control circuit voltage before ordering. If you are unsure of fitment, our HVAC parts specialists verify compatibility before your order ships — 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 $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 FF1DNA024005AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier FF1DNA024005AAAA. 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 FF1DNA024005AAAA?
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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