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OEM Carrier 40VA 120V to 24V Control Transformer for C48A203552 — Ships Today
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C48A203552 — Ships Today

SKU: CARRIE-C48A203552-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V/24V for Model C48A203552

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C48A203552 packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, control board, contactor coil, and all low-voltage control circuits. When this transformer fails, absolutely nothing in the control system responds — the thermostat goes blank, the system won't call for heating or cooling, and no fault codes appear because the board itself has no power.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched to Carrier C48A203552 electrical specifications
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the factory control board. Undersized or off-tolerance generic transformers can overheat, trip their internal fuse, or cause erratic low-voltage behavior that mimics board or thermostat failure.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: multimeter (verify 0V before touching wiring), 1/4" and 5/16" nut drivers, wire stripper. Always verify primary and secondary voltages after installation before restoring control circuit connections.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our stocked warehouse.

Compatibility: Engineered for Carrier model C48A203552 packaged units. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If you're unsure whether this is the right part, our HVAC parts specialists verify fitment before you buy — no guesswork required. Order now and get same-day shipping on in-stock OEM 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 C48A203552 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C48A203552 — Ships Today. 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 C48A203552 — Ships Today?
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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