Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier Transformer 40VA 120V/24V for C48A505061
Carrier

OEM Carrier Transformer 40VA 120V/24V for C48A505061

SKU: CARRIE-C48A505061-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C48A505061 — or your money back. Terms

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V/24V for Model C48A505061

This OEM replacement transformer (part number HT01BD236) is the factory-specified step-down transformer for the Carrier C48A505061 packaged unit. The transformer converts 120V line voltage to 24V AC to power the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, nothing in the control system responds: your thermostat goes blank, the system won't call for heating or cooling, and no safety or control functions operate. It is often the first component to check when an entire unit goes unresponsive.

  • Specs: 40VA rated | Primary voltage: 120V AC | Secondary voltage: 24V AC | Factory-matched OEM design for Carrier packaged systems | Part number HT01BD236
  • OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and insulation class requirements. Generic transformers are frequently underrated, causing overheating, nuisance tripping, and premature failure — especially in systems with multiple 24V accessories or zone controls.
  • Install difficulty: 2/5 — Shut off all power to the unit at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter for voltage verification. Photograph all wiring connections before disconnecting. Confirm secondary output reads 24V AC after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Designed for the Carrier C48A505061 packaged unit. Verify your existing transformer's primary/secondary voltage and VA rating against your unit's data plate before ordering. If you are unsure of fitment, our parts specialists will confirm compatibility before your order ships — contact us today and get back up and running fast.

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 C48A505061?
Yes. This is the factory-specified OEM transformer for the Carrier C48A505061. 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 C48A505061?
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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online