What are the specs for this Transformer?

The correct replacement for Carrier model PF4MNA042000AAAA 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 PF4MNA042000AAAA.

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 24V for PF4MNA042000AAAA

Name: OEM Carrier Transformer 40VA 24V for PF4MNA042000AAAA
Brand: Carrier
SKU: CARRIE-PF4MNA042000AAAA-TRANSFORMER-HT01CN241
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-PF4MNA042000AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

✓ Guaranteed to fit PF4MNA042000AAAA — or your money back. Terms

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OEM Carrier 40VA Control Transformer HT01CN241 for Model PF4MNA042000AAAA

This OEM control transformer is the factory-specified replacement part HT01CN241 for the Carrier PF4MNA042000AAAA fan coil air handler unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat circuit, control board, and all low-voltage control wiring. When it fails, the entire control circuit goes dead — your thermostat loses power, the system stops responding, and no heating or cooling operation is possible.

Specs: Input: 120V AC | Output: 24V AC | 40VA rated capacity | Direct OEM replacement for part number HT01CN241 | Factory-matched windings and mounting footprint
OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Under-rated or off-tolerance aftermarket units can damage sensitive electronics on the IFC board or cause nuisance tripping of the fuse on the control circuit.
Install difficulty: 2/5 — Always shut off power at the breaker and confirm voltage is zero with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connects. Label all 24V wires before disconnecting the old unit. Verify the fuse on the control board is intact before assuming the transformer is the failure point.
Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier PF4MNA042000AAAA fan coil air handler (3.5-ton nominal). Always verify your unit's data plate voltage and VA requirements match before ordering. Our parts specialists are available to confirm fitment — contact us before you order if you have any questions.

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

OEM Carrier Transformer 40VA 24V...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier PF4MNA042000AAAA?

Yes. This is the factory-specified OEM transformer for the Carrier PF4MNA042000AAAA. 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 PF4MNA042000AAAA?

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 24V for PF4MNA042000AAAA

OEM Carrier 40VA Control Transformer HT01CN241 for Model PF4MNA042000AAAA

Shipping Information

Return Policy

Frequently Asked Questions