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OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW03561 | National HVAC Parts
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW03561 | National HVAC Parts

SKU: CARRIE-C4850C50AW03561-TRANSFORMER-HT01BD236 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V→24V for Model C4850C50AW03561

This OEM control circuit transformer (part number HT01BD236) is the factory-specified replacement for the Carrier C4850C50AW03561 packaged unit. The transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this component fails, absolutely nothing responds: the thermostat goes dark, the system won't call for heating or cooling, and no error codes appear because the control board itself has lost power.

  • Specs: 40VA rating | 120V primary / 24V secondary | Class 2 control transformer | OEM part number HT01BD236 | Factory-matched output stability
  • OEM vs Generic: OEM transformers maintain tighter voltage regulation under varying load conditions. Undersized or off-tolerance generic transformers can cause nuisance lockouts, contactor chatter, and premature control board failure — costing far more than the price difference.
  • Install difficulty: 2/5 — Shut off all power to the unit at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify 24V output with a multimeter after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our stocked warehouse.

Compatibility: Designed specifically for the Carrier C4850C50AW03561 packaged unit. Confirm your unit's data plate voltage requirements match 120V primary / 24V secondary 40VA before ordering. Our parts specialists are available to verify fitment — order with confidence and get back up and running today.

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 C4850C50AW03561 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C50AW03561 | 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 C4850C50AW03561 | 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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