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OEM Carrier 40VA Transformer 208/230V–24V HT01CN241 — PF4MNB043000AAAA
Carrier

OEM Carrier 40VA Transformer 208/230V–24V HT01CN241 — PF4MNB043000AAAA

SKU: CARRIE-PF4MNB043000AAAA-TRANSFORMER-HT01CN241 Brand: Carrier
✓ Guaranteed to fit PF4MNB043000AAAA — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNB043000AAAA

This OEM Carrier transformer (part #HT01CN241) is the factory-specified 40VA control transformer for the Carrier PF4MNB043000AAAA fan coil and air handler unit. The transformer steps down line voltage from 208/230V on the primary side to a safe 24V AC on the secondary side, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control system goes dark: the thermostat goes blank, the system won't respond to calls for heating or cooling, and nothing turns on. Replacing it is one of the quickest ways to restore full system operation.

  • Specs: 208/230V primary | 24V secondary | 40VA power rating | OEM part #HT01CN241 | Direct factory replacement
  • OEM vs Generic: This is a genuine OEM Carrier transformer built to exact factory voltage and VA specifications. Generic transformers may be rated at ±10% tolerance, risking under-voltage to the control board or contactor coil and shortening component life.
  • Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all 24V secondary wires before disconnecting. Verify primary voltage (208V vs. 230V) on the unit data plate before ordering.
  • Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-matched replacement for the Carrier PF4MNB043000AAAA fan coil/air handler. Verify your unit's primary voltage and VA requirement on the data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — order today and receive fast, same-day shipping.

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 OEM Carrier 40VA Transformer 208/230V–24V HT01CN241 — PF4MNB043000AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier 40VA Transformer 208/230V–24V HT01CN241 — PF4MNB043000AAAA. 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 OEM Carrier 40VA Transformer 208/230V–24V HT01CN241 — PF4MNB043000AAAA?
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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