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OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW04051 — Ships Today
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW04051 — Ships Today

SKU: CARRIE-C4850C50AW04051-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50AW04051

This is the OEM factory replacement transformer (part number HT01BD236) for the Carrier C4850C50AW04051 packaged unit. The transformer steps down 120V primary voltage to the 24V secondary signal that powers your thermostat, control board, contactor coil, and every low-voltage safety circuit in the system. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the unit refuses to start, and no fault codes are generated because the board itself has no power to report them.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched impedance and thermal cutoff protection
  • OEM vs Generic: OEM transformers from Carrier are wound to exact VA and voltage tolerances. Undersized or off-tolerance generic transformers overheat under load, trip thermal cutoffs prematurely, and can damage sensitive control boards — making OEM the only safe choice for this application.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Photograph or label all low-voltage wire connections before removing the old transformer.
  • Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C4850C50AW04051 packaged unit. Always verify the 40VA rating and 120V/24V configuration against your unit's wiring diagram and data plate before ordering. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions. Order today and get same-day shipping to get your system back up 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 $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 C4850C50AW04051 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50AW04051 — 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 C4850C50AW04051 — 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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