What are the specs for this Transformer?

The correct replacement for Carrier model FY5BNF018008AAAA 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 FY5BNF018008AAAA.

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 FY5BNF018008AAAA

Name: OEM Carrier Transformer 40VA 120V-24V for FY5BNF018008AAAA
Brand: Carrier
SKU: CARRIE-FY5BNF018008AAAA-TRANSFORMER-HT01CN241
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-FY5BNF018008AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

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OEM Carrier Transformer 40VA 120V–24V for Model FY5BNF018008AAAA

This is the factory OEM replacement transformer (part number HT01CN241) for the Carrier FY5BNF018008AAAA. The transformer is the backbone of your system's low-voltage control circuit, stepping down 120V line voltage to the 24V signal that powers your thermostat, control board, contactor coil, and all safety circuits. When the transformer fails, the entire control circuit goes dark — your thermostat will be unresponsive, the system will not call for heating or cooling, and no fault codes will display because there is no power to generate them.

Specs: 40VA rating | 120V primary / 24V secondary | Class 2 rated | Direct OEM replacement for part number HT01CN241 | Factory-matched to Carrier FY5BNF018008AAAA wiring harness
OEM vs Generic: OEM transformers are wound and insulated to exact Carrier tolerances, delivering stable 24V output under full load. Generic units often sag under peak current draw, causing nuisance lockouts and premature control board failure.
Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Test incoming 120V and confirm 24V output after install before closing the unit.
Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier FY5BNF018008AAAA. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. If you have any fitment questions, our HVAC parts specialists confirm compatibility before you buy — 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

OEM Carrier Transformer 40VA 120...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier FY5BNF018008AAAA?

Yes. This is the factory-specified OEM transformer for the Carrier FY5BNF018008AAAA. 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 FY5BNF018008AAAA?

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 FY5BNF018008AAAA

OEM Carrier Transformer 40VA 120V–24V for Model FY5BNF018008AAAA

Shipping Information

Return Policy

Frequently Asked Questions