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OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW04151 — Ships Today
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW04151 — Ships Today

SKU: CARRIE-C4850C50AW04151-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V–24V for Model C4850C50AW04151

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C4850C50AW04151 packaged unit. The transformer steps line voltage (120V) down to the 24V signal voltage that powers your thermostat, control board, contactor coil, and all low-voltage controls. When this component fails, the entire control circuit goes dark — the thermostat displays nothing, the system refuses to respond to calls for heating or cooling, and you may blow a 3A fuse repeatedly as a symptom of a shorted secondary winding.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Designed to factory tolerance for the Carrier C4850C50AW04151 packaged unit
  • OEM vs Generic: This OEM transformer is wound and insulated to Carrier's exact VA and thermal specifications. Generic transformers frequently underrate their true VA capacity, leading to premature overheating, nuisance fuse failures, and reduced service life in demanding packaged-unit applications.
  • Install Difficulty: 2/5 — Shut off all power at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, and a multimeter to confirm 24V output on the secondary after installation. Label or photograph all low-voltage wiring connections before removal.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our HVAC parts warehouse.

Compatibility: Engineered specifically for the Carrier C4850C50AW04151 packaged unit. Always verify your unit's data plate voltage requirements and existing transformer VA rating before ordering to ensure a direct fit. Not sure it's the right part? Our HVAC parts specialists confirm fitment before you buy — reach out before placing your order.

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 $75
  • 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 C4850C50AW04151 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50AW04151 — Ships Today. 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 C4850C50AW04151 — Ships Today?
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
HVAC Parts Specialist — Online