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OEM Carrier Transformer 40VA 120V-24V for C4850C50Z3055200
Carrier

OEM Carrier Transformer 40VA 120V-24V for C4850C50Z3055200

SKU: CARRIE-C4850C50Z3055200-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V/24V for Model C4850C50Z3055200

This OEM replacement transformer (part number HT01BD236) is the factory-specified step-down transformer for the Carrier C4850C50Z3055200 packaged gas/electric unit. The transformer converts 120V primary power to the 24V secondary voltage required to operate the control board, thermostat circuit, and all low-voltage safety controls. When this component fails, the entire control circuit goes dead — the thermostat displays nothing, the system will not call for heating or cooling, and no safety outputs will energize. A blown fuse on the control board is often the first symptom of a failing or overloaded transformer.

  • Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | Factory-matched OEM tolerance for reliable low-voltage output | OEM Part Number: HT01BD236
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications. Undersized or off-tolerance generic units can overheat, repeatedly blow fuses, or deliver insufficient voltage to hold contactors and gas valve coils closed — causing intermittent lockouts.
  • Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter for output verification. Label or photograph all wire connections before removal. Confirm output reads 24–28V AC after installation.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C4850C50Z3055200 packaged unit. Verify the 120V primary / 24V secondary / 40VA rating on your existing transformer's label before ordering to confirm fitment. If you are unsure, our HVAC parts specialists can verify compatibility before you purchase — no guesswork required. Order today and get same-day shipping on all in-stock OEM parts.

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 C4850C50Z3055200?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50Z3055200. 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 C4850C50Z3055200?
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
HVAC Parts Specialist — Online