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OEM Carrier Transformer 40VA 120V/24V for C4850C48ZG070600
Carrier

OEM Carrier Transformer 40VA 120V/24V for C4850C48ZG070600

SKU: CARRIE-C4850C48ZG070600-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA for Model C4850C48ZG070600

This OEM control transformer (part number HT01BD236) is the factory-specified replacement for the Carrier C4850C48ZG070600 packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, control board, contactor coil, and all low-voltage safety circuits. When it fails, the entire control circuit goes dead — the thermostat goes blank, the system makes no response to any call for heating or cooling, and the contactor will not energize. It is one of the first components to check when nothing works at all.

  • Specs: 40VA rated | 120V primary / 24V secondary | Single-phase | Class 2 output | OEM part number HT01BD236 — factory tolerance matched for Carrier packaged systems
  • OEM vs Generic: OEM transformers are wound to exact VA capacity and insulation class for your unit. Undersized or off-tolerance generic replacements can overheat, blow the fuse repeatedly, or deliver unstable 24V output that causes nuisance lockouts across multiple components.
  • Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (verify 0V before touching terminals). Photograph all low-voltage wiring connections prior to removal. Secure wire nuts firmly on all splices after installation.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Carrier C4850C48ZG070600 packaged unit. Always verify primary voltage, secondary voltage, and VA rating on your unit's data plate before ordering to ensure proper fitment. Our parts specialists are available to confirm compatibility before you buy — same-day shipping means you're back up and running 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 C4850C48ZG070600?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C48ZG070600. 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 C4850C48ZG070600?
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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