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OEM Carrier Transformer 40VA 120V/24V for C50A505052 — HT01BD236
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A505052 — HT01BD236

SKU: CARRIE-C50A505052-TRANSFORMER-HT01BD236 Brand: Carrier

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OEM Carrier 40VA Control Transformer for Model C50A505052 — Part HT01BD236

This OEM control transformer (part number HT01BD236) is the factory-specified replacement for the Carrier C50A505052 packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When it fails, absolutely nothing responds: the thermostat goes dark, the system won't call for heating or cooling, and no components energize. It is often the first component to diagnose when a system appears completely unresponsive.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched output tolerance for reliable low-voltage control
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class. Generic transformers are frequently undersized, leading to voltage sag that causes intermittent lockouts, nuisance tripping, and premature contactor coil failure.
  • 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 post-install). Label or photograph all low-voltage wiring before disconnecting. Confirm fuse or breaker on secondary circuit is intact before condemning the transformer.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed by 3PM local time ship same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier C50A505052 commercial packaged rooftop unit. Verify your existing transformer's VA rating, primary voltage, and secondary voltage on the unit data plate or wiring diagram before ordering. Cross-reference OEM part number HT01BD236 to confirm fitment. Need help verifying? Our HVAC parts specialists confirm compatibility before every order — no guesswork.

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 C50A505052 — HT01BD236?
Yes. This is the factory-specified OEM transformer for the Carrier C50A505052 — HT01BD236. 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 C50A505052 — HT01BD236?
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