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OEM Carrier Transformer 40VA 24V for C48A503562 — HT01BD236
Carrier

OEM Carrier Transformer 40VA 24V for C48A503562 — HT01BD236

SKU: CARRIE-C48A503562-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 C48A503562

This OEM control transformer is the factory-specified replacement for the Carrier C48A503562 packaged unit. The transformer steps down line voltage (120V) to the 24V signal required by your thermostat, contactor coil, and all low-voltage control circuitry. When this component fails, absolutely nothing in the control system responds — the thermostat goes dark, the unit refuses to start, and no call for heating or cooling is ever received. It is one of the first components to check when a system appears completely unresponsive.

  • Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | OEM part numbers HT01BD236 and HT01BD702 — direct factory replacement
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for Carrier packaged equipment. Undersized or off-tolerance generic transformers can overheat, trip internal fuses repeatedly, or fail to sustain 24V under full contactor load — causing nuisance lockouts and premature board failures.
  • Install Difficulty: 2/5 — Disconnect power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 0V at primary terminals before handling. Note wire colors and terminal positions before disconnecting the old unit.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C48A503562 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Replaces OEM part numbers HT01BD236 and HT01BD702. Not sure this is the right part? Our HVAC parts specialists verify fitment before you order — reach out before purchasing.

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 C48A503562 — HT01BD236?
Yes. This is the factory-specified OEM transformer for the Carrier C48A503562 — HT01BD236. 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 C48A503562 — HT01BD236?
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
HVAC Parts Specialist — Online