What are the specs for this Transformer?

The correct replacement for Carrier model FV4CNF005000AAAA is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Carrier equipment which lists the model number FV4CNF005000AAAA.

Is this transformer compatible with Bryant or Payne systems too?

Many Carrier parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Carrier

OEM Carrier Transformer 40VA 120V/24V for FV4CNF005000AAAA

Name: OEM Carrier Transformer 40VA 120V/24V for FV4CNF005000AAAA
Brand: Carrier
SKU: CARRIE-FV4CNF005000AAAA-TRANSFORMER-HT01CN236
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-FV4CNF005000AAAA-TRANSFORMER-HT01CN236 Brand: Carrier

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OEM Carrier Transformer 40VA 120V/24V for Model FV4CNF005000AAAA

This OEM replacement transformer (part number HT01CN236) is the factory-specified control circuit transformer for the Carrier FV4CNF005000AAAA fan coil air handler. The transformer steps down line voltage from 120V to 24V AC to power the control board, thermostat, and all low-voltage system controls. When this transformer fails, the entire control circuit goes dark — your thermostat shows no response, the system won't call for heating or cooling, and the unit sits completely unresponsive regardless of settings.

Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched for Carrier FV4CNF005000AAAA air handlers
OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage tolerances. Undersized or off-spec generic transformers can sag under full control load, causing intermittent lockouts, nuisance tripping, and premature control board failure — a far costlier repair.
Install difficulty: 2/5 — Shut off power at the breaker and verify with a non-contact voltage tester before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wiring connections before disconnecting. The transformer mounts to the air handler cabinet and reconnects to the control board harness.
Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier FV4CNF005000AAAA fan coil air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Not sure this is the right part? Our HVAC parts specialists verify fitment before you buy — no guesswork, no returns.

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

OEM Carrier Transformer 40VA 120...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier FV4CNF005000AAAA?

Yes. This is the factory-specified OEM transformer for the Carrier FV4CNF005000AAAA. 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 FV4CNF005000AAAA?

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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OEM Carrier Transformer 40VA 120V/24V for FV4CNF005000AAAA

OEM Carrier Transformer 40VA 120V/24V for Model FV4CNF005000AAAA

Shipping Information

Return Policy

Frequently Asked Questions