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OEM Carrier Transformer 40VA 120V to 24V for C4850C50AK03061 — Ships Today
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50AK03061 — Ships Today

SKU: CARRIE-C4850C50AK03061-TRANSFORMER-HT01BD236 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50AK03061

This is the factory OEM replacement control transformer (part number HT01BD236) for the Carrier C4850C50AK03061 packaged unit. The transformer steps down line voltage (120V) to the 24V signal voltage required to power the control board, thermostat circuit, contactor coil, and all low-voltage accessories. When this component fails, the entire control circuit goes dead — the thermostat loses communication, the contactor won't energize, and the system will not respond to any heating or cooling calls. If you're seeing a completely unresponsive unit with confirmed 120V supply present, this transformer is among the first components to test.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM Part Number: HT01BD236 | Factory-matched terminals and mounting footprint
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for the Carrier C4850C50AK03061 control circuit. Generic units may output unstable 24V under load, causing intermittent lockouts, nuisance trips, or premature control board failure.
  • Install Difficulty: 2/5 — Disconnect power at the breaker and confirm zero voltage with a multimeter before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wiring before removal. Check for a blown secondary fuse as the root cause before replacing the transformer.
  • Warranty: 1-year OEM factory warranty included. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier C4850C50AK03061 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before your order ships — reach out today and get your system back online fast.

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 C4850C50AK03061 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50AK03061 — 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 C4850C50AK03061 — 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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