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OEM Carrier Transformer 40VA 120V-24V for C50A403562
Carrier

OEM Carrier Transformer 40VA 120V-24V for C50A403562

SKU: CARRIE-C50A403562-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C50A403562 — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 40VA Control Transformer for Model C50A403562

This OEM control transformer is the factory-specified replacement for the Carrier C50A403562 packaged unit. The transformer steps down line voltage (120V) to the 24V AC signal used by your thermostat, contactor coil, gas valve, and all low-voltage control components. When this part fails, the entire control circuit goes dead — the thermostat display may go blank, the system won't respond to any call for heating or cooling, and no fault codes will appear because the board itself has no power. OEM part numbers HT01BD236 and HT01BD702 are direct factory replacements.

  • Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | Factory-matched primary and secondary winding tolerances for stable control voltage
  • OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA and thermal specifications. Undersized or off-tolerance aftermarket units can overheat under full control circuit load, tripping the built-in thermal fuse and causing intermittent lockouts — replacing the OEM unit eliminates that risk entirely.
  • Install Difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 120V input and 24V output with a multimeter after installation before restoring the full system. Label or photograph all wiring prior to disconnecting.
  • Warranty: 1-year OEM factory warranty. In-stock units ship the same business day from our warehouse.

Compatibility: Designed for the Carrier C50A403562 commercial packaged rooftop unit. Cross-references OEM part numbers HT01BD236 and HT01BD702. Always confirm your unit's control voltage and VA requirements on the data plate before ordering. Need fitment help? Our HVAC parts team verifies compatibility before you buy — order with confidence and get your system back online 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 $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 C50A403562?
Yes. This is the factory-specified OEM transformer for the Carrier C50A403562. 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 C50A403562?
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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