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OEM Carrier 40VA 120V to 24V Control Transformer for C48A204061 | National HVAC Parts
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C48A204061 | National HVAC Parts

SKU: CARRIE-C48A204061-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 C48A204061

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C48A204061 packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, control board, contactor coil, and all low-voltage safety controls. When the transformer fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat display response, no contactor pull-in, and no fan or compressor operation regardless of thermostat demand.

  • Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | OEM part number HT01BD236 | Factory-matched output tolerance for stable control voltage
  • OEM vs Generic: OEM transformers maintain tighter voltage regulation under load, protecting sensitive control boards and thermostats from voltage fluctuation that can cause nuisance lockouts or premature board failure. Generic units frequently run under-rated VA, causing thermal cutout trips on high-demand days.
  • Install difficulty: 2/5 — Always disconnect power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify primary and secondary voltages with a multimeter after installation before restoring full operation.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier C48A204061 packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required.

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 C48A204061 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C48A204061 | 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 C48A204061 | 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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