What are the specs for this Transformer?

The correct replacement for Carrier model FB4ANF030000AFAA 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 FB4ANF030000AFAA.

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 FB4ANF030000AFAA

Name: OEM Carrier Transformer 40VA 120V/24V for FB4ANF030000AFAA
Brand: Carrier
SKU: CARRIE-FB4ANF030000AFAA-TRANSFORMER-HT01CN236
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-FB4ANF030000AFAA-TRANSFORMER-HT01CN236 Brand: Carrier

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OEM Carrier 40VA Control Transformer for Model FB4ANF030000AFAA Air Handler

This OEM replacement transformer (part# HT01CN236) is the factory-specified control transformer for the Carrier FB4ANF030000AFAA fan coil air handler. The 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 displays nothing or the system simply refuses to respond to any call for heating or cooling. A failed transformer is often identified by a blown fuse on the control board or a burned, shorted winding detected with a multimeter.

Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory-matched windings for Carrier FB4ANF030000AFAA | OEM Part Number: HT01CN236
OEM vs Generic: This is the genuine OEM Carrier transformer wound to exact factory VA and voltage tolerances. Generic transformers frequently run undersized VA ratings, causing premature thermal cutout trips and repeated control circuit failures — especially under high-demand multi-zone systems.
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 post-install). Photograph or label all low-voltage wiring connections before removal. The transformer typically mounts to the control bracket with two screws and uses push-on or screw-terminal low-voltage leads.
Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier FB4ANF030000AFAA fan coil air handler. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering to ensure a correct fit. Not sure it's the right part? Our HVAC parts specialists confirm fitment before you buy — order with confidence and get your system back online today.

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 FB4ANF030000AFAA?

Yes. This is the factory-specified OEM transformer for the Carrier FB4ANF030000AFAA. 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 FB4ANF030000AFAA?

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 FB4ANF030000AFAA

OEM Carrier 40VA Control Transformer for Model FB4ANF030000AFAA Air Handler

Shipping Information

Return Policy

Frequently Asked Questions