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OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW03061 — Ships Today
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW03061 — Ships Today

SKU: CARRIE-C4850C50AW03061-TRANSFORMER-HT01BD236 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 120V to 24V for Model C4850C50AW03061

This is the OEM factory-replacement control transformer (part number HT01BD236) for the Carrier C4850C50AW03061 packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead — the thermostat loses power, the system won't respond to any call for heating or cooling, and no error codes will display because even the board has no power. A failed transformer is often misdiagnosed as a control board failure, so always verify 24V output at the secondary terminals before replacing larger components.

  • Specs: 40VA rated | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched mounting footprint and terminal configuration
  • OEM vs Generic: This OEM transformer is wound to exact VA and voltage tolerance specifications for the C4850C50AW03061. Generic transformers frequently underperform at rated VA, causing nuisance lockouts and premature control board failures due to voltage sag under load.
  • Install Difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Test secondary output (should read 24–28V AC) before buttoning up the unit. Label all wires before disconnecting.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Carrier C4850C50AW03061 packaged unit. Cross-reference OEM part number HT01BD236 on your unit's wiring diagram or data plate to confirm fitment. Not sure if this is your part? Our HVAC parts specialists verify fitment before you order — reach out before purchasing. In stock and ships today.

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 C4850C50AW03061 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50AW03061 — 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 C4850C50AW03061 — 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
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