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OEM Carrier 40VA 120V to 24V Control Transformer for C48A203562 — Ships Today
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C48A203562 — Ships Today

SKU: CARRIE-C48A203562-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer for Model C48A203562

This OEM control transformer is the factory-specified replacement for the Carrier C48A203562 packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, contactor coil, and all low-voltage control circuits. When it fails, the entire control circuit goes dark — nothing responds at the thermostat, no contactor energizes, and the system will not start regardless of demand. A failed transformer is one of the most overlooked causes of a completely unresponsive HVAC system.

  • Specs: Input 120V primary | 24V secondary output | 40VA rated | OEM Part Numbers: HT01BD236 / HT01BD702 | Factory-matched electrical specifications
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for the Carrier C48A203562 control board. Undersized or off-tolerance aftermarket units can overheat, blow the control fuse repeatedly, or deliver unstable 24V output that causes nuisance lockouts.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all wires before disconnecting the old transformer. Verify 24V output with a multimeter before reassembling the panel.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C48A203562 packaged unit. Before ordering, verify your existing transformer's primary voltage, secondary voltage, and VA rating on the unit data plate or original transformer label. Cross-reference OEM part numbers HT01BD236 and HT01BD702 to confirm fitment. Our parts specialists are available to verify compatibility before you order — reach out before purchasing if you have any questions.

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 C48A203562 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C48A203562 — 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 C48A203562 — 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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