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OEM Carrier Transformer 40VA 120V to 24V for C48A402061 | National HVAC Parts
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C48A402061 | National HVAC Parts

SKU: CARRIE-C48A402061-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA for Model C48A402061

This OEM Carrier transformer (part number HT01BD236) is the factory-specified replacement for the C48A402061 packaged unit. The transformer steps down 120V line voltage to 24V AC to power the entire control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, absolutely nothing responds: the thermostat goes blank, the system won't call for heating or cooling, and you may find a blown low-voltage fuse. It's one of the first components to check when the whole system appears dead.

  • Specs: 40VA rating | 120V primary / 24V secondary | Single-phase | OEM part number HT01BD236 | Factory-matched output tolerances for reliable control circuit operation
  • OEM vs Generic: This OEM transformer is wound and rated to Carrier's exact factory specifications. Generic transformers may underperform at rated VA load, causing intermittent control failures, nuisance fuse blowing, and premature contactor coil burnout.
  • Install Difficulty: 2/5 — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label or photograph all low-voltage wiring before disconnecting. Verify 24V output with a multimeter after installation before re-energizing the full system.
  • Warranty: 1-year OEM factory warranty. Orders placed by cutoff ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier C48A402061 packaged unit. Always confirm the transformer's VA rating and primary/secondary voltages match your unit's data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to verify compatibility before you purchase — same-day shipping available on all in-stock OEM Carrier 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 C48A402061 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C48A402061 | National HVAC Parts. 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 C48A402061 | National HVAC Parts?
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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