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OEM Carrier 40VA Transformer 120V–24V for UPFLOW100U3619A
Carrier

OEM Carrier 40VA Transformer 120V–24V for UPFLOW100U3619A

SKU: CARRIE-UPFLOW100U3619A-TRANSFORMER-HT01CN001 Brand: Carrier
✓ Guaranteed to fit UPFLOW100U3619A — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer (HT01CN001) for Model UPFLOW100U3619A

The Carrier HT01CN001 is the factory-specified 40VA step-down transformer for the UPFLOW100U3619A air handler. This critical component converts 120V line voltage down to the 24V AC signal that powers your entire control circuit — including the thermostat, contactor coil, zone boards, and any connected accessories. When this transformer fails, the system goes completely silent: no thermostat response, no blower, no heat or cool — nothing. Replacing it with the correct OEM unit ensures the control circuit operates at the exact voltage and current capacity the system was designed for.

  • Specs: 40VA rating | 120V primary input | 24V secondary output | Direct OEM replacement for Carrier part number HT01CN001 | Factory tolerance matched
  • OEM vs Generic: OEM transformers are wound and rated to Carrier's exact VA specification, preventing control board brownouts and nuisance tripping. Generic units often underrate their VA capacity, causing overheating and premature failure under full control-circuit load.
  • Install Difficulty: 2/5 — Always shut off power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output across secondary terminals after installation before restoring full power. Photograph all wiring connections prior to removal.
  • Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier UPFLOW100U3619A air handler. Always confirm your unit's control circuit voltage and VA demand from the data plate or wiring diagram before ordering. Our technical team is available to verify fitment — don't hesitate to reach out before you buy. Order today and receive same-day shipping on all in-stock OEM parts.

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 UPFLOW100U3619A?
Yes. This is the factory-specified OEM transformer for the Carrier UPFLOW100U3619A. 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 UPFLOW100U3619A?
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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