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OEM Carrier Transformer 120V–24V 40VA for PF1MNB018010AAAA
Carrier

OEM Carrier Transformer 120V–24V 40VA for PF1MNB018010AAAA

SKU: CARRIE-PF1MNB018010AAAA-TRANSFORMER-HT01CN241 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier Control Transformer 120V/24V 40VA for Model PF1MNB018010AAAA

This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier PF1MNB018010AAAA fan coil unit. The transformer steps down 120V line voltage to the 24V AC signal that powers every component in the control circuit — thermostat, zone valves, relays, and the control board itself. When the transformer fails, the entire low-voltage control circuit goes dead: the thermostat goes blank, the system will not respond to any call for heating or cooling, and in some cases a failed transformer will trip repeatedly due to a short elsewhere in the 24V circuit.

  • Specs: 120V primary | 24V secondary | 40VA output | Factory-matched OEM construction | Blade or screw terminal connections (verify against unit wiring diagram)
  • OEM vs Generic: OEM transformers are wound and rated to exact factory specifications, ensuring proper VA capacity under full control-circuit load. Generic units are often under-rated, causing thermal cutouts to trip prematurely and shortening the life of connected components.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output and rule out a downstream short before installing the new unit). Always identify and correct any 24V short-circuit before replacing — a shorted control circuit will blow the new transformer immediately.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PF1MNB018010AAAA fan coil unit. Confirm primary voltage (120V) and VA rating (40VA) on your unit's data plate before ordering. Not sure this is the right part? Our HVAC parts specialists verify fitment before you order — contact us for fast confirmation.

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

Frequently Asked Questions

Does this Transformer fit my Carrier PF1MNB018010AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier PF1MNB018010AAAA. 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 PF1MNB018010AAAA?
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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Mike Rivera
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