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OEM Carrier Transformer 40VA 120V to 24V for C4850C48ZN035600 — Ships Today
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C48ZN035600 — Ships Today

SKU: CARRIE-C4850C48ZN035600-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Transformer 40VA 120V/24V for Model C4850C48ZN035600

This OEM replacement transformer (part number HT01BD236) is the factory-specified step-down transformer for the Carrier C4850C48ZN035600 packaged unit. The transformer converts 120V line voltage down to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, absolutely nothing in the control circuit responds: the thermostat goes blank, the system won't call for heating or cooling, and the unit sits completely unresponsive despite power being present at the unit.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched output tolerance for stable control voltage
  • OEM vs Generic: OEM transformers maintain tight output voltage regulation under load, protecting sensitive control boards and thermostats from voltage fluctuations that generic units often produce. Using the correct OEM part prevents nuisance lockouts and premature board failures.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Photograph all low-voltage wiring connections before disconnecting the old transformer.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier C4850C48ZN035600 packaged unit. Verify the OEM part number HT01BD236 against your unit's data plate or existing transformer label before ordering. If you're unsure about fitment, our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required.

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 C4850C48ZN035600 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C48ZN035600 — 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 C4850C48ZN035600 — 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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