What are the specs for this Transformer?

The correct replacement for Carrier model PF1MNB018000AAAA 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 PF1MNB018000AAAA.

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 208/230V 40VA 24V for PF1MNB018000AAAA

Name: OEM Carrier Transformer 208/230V 40VA 24V for PF1MNB018000AAAA
Brand: Carrier
SKU: CARRIE-PF1MNB018000AAAA-TRANSFORMER-HT01CN241
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-PF1MNB018000AAAA-TRANSFORMER-HT01CN241 Brand: Carrier

✓ Guaranteed to fit PF1MNB018000AAAA — or your money back. Terms

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OEM Carrier Control Transformer 208/230V 40VA for Model PF1MNB018000AAAA

This OEM Carrier transformer (part #HT01CN241) is the factory-specified 40VA step-down transformer for the Carrier PF1MNB018000AAAA fan coil and air handler series. Its primary job is to step line voltage down from 208/230V to a safe 24V AC, powering the thermostat signal wiring, control board, and all low-voltage switching in the system. When the transformer fails, nothing in the control circuit works — the thermostat goes dark, contactors don't energize, and the system produces no heating or cooling response whatsoever.

Specs: 208/230V Primary | 24V Secondary | 40VA Power Rating | Direct OEM drop-in replacement for Carrier part #HT01CN241
OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerance specs. Undersized or off-tolerance aftermarket transformers can overheat, blow fuses, or damage control boards — stick with OEM for a part this critical.
Install Difficulty: 2/5 — Always shut off power at the breaker and verify zero voltage with a multimeter before touching wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all 24V secondary wires before disconnecting the old unit.
Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model PF1MNB018000AAAA fan coil and air handler units. Verify your unit's data plate shows a 208/230V primary and 24V secondary requirement before ordering. Our fitment team is available to confirm compatibility — reach out before you order if you're unsure.

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 208/230V...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier PF1MNB018000AAAA?

Yes. This is the factory-specified OEM transformer for the Carrier PF1MNB018000AAAA. 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 PF1MNB018000AAAA?

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 208/230V 40VA 24V for PF1MNB018000AAAA

OEM Carrier Control Transformer 208/230V 40VA for Model PF1MNB018000AAAA

Shipping Information

Return Policy

Frequently Asked Questions