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OEM Carrier Transformer 40VA 120V/24V for C50A306051
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A306051

SKU: CARRIE-C50A306051-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C50A306051 — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA for Model C50A306051

This OEM Carrier transformer (part number HT01BD236) is the factory-specified replacement for the C50A306051 packaged unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control circuits. When this transformer fails, the entire control circuit goes dark — the thermostat display may go blank, the system won't respond to any inputs, and the unit will not heat or cool regardless of settings.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V AC | OEM part number HT01BD236 | Direct factory replacement with correct mounting footprint and wire leads
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for the C50A306051 control circuit. Undersized or off-tolerance generic units can cause nuisance tripping, erratic board behavior, or premature failure of downstream low-voltage components.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify incoming voltage and confirm the secondary fuse (if present) before condemning the transformer. Label all wires prior to removal.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C50A306051 commercial packaged rooftop unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Need help confirming fitment? Our HVAC parts team is ready to verify compatibility before you buy.

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 C50A306051?
Yes. This is the factory-specified OEM transformer for the Carrier C50A306051. 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 C50A306051?
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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