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OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW02061 | National HVAC Parts
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW02061 | National HVAC Parts

SKU: CARRIE-C4850C50AW02061-TRANSFORMER-HT01BD236 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V–24V for Model C4850C50AW02061

This is the factory OEM replacement transformer (part number HT01BD236) for the Carrier C4850C50AW02061 packaged unit. The transformer steps line voltage down from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, nothing responds: the thermostat goes blank, the system won't energize, and you may find a blown fuse on the control board. Replacing the transformer is one of the fastest ways to restore full system operation after a control circuit failure.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched output voltage tolerance for stable control circuit operation
  • OEM vs Generic: This OEM transformer is wound and tested to Carrier's exact VA and voltage specifications. Generic transformers frequently under-deliver on VA capacity, causing nuisance fuse failures and erratic thermostat behavior under load.
  • Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdriver, multimeter, wire nuts or spade connectors. Verify fuse integrity on the control board before energizing — a shorted load can blow a new transformer immediately if the root cause isn't addressed first.
  • Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier C4850C50AW02061 packaged units. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — contact us 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 $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 C4850C50AW02061 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50AW02061 | National HVAC Parts. 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 C4850C50AW02061 | National HVAC Parts?
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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