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 FB4ANF048008AFAA
Carrier

OEM Carrier Transformer 40VA 120V/24V for FB4ANF048008AFAA

SKU: CARRIE-FB4ANF048008AFAA-TRANSFORMER-HT01CN236 Brand: Carrier

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01CN236 for Model FB4ANF048008AFAA

This OEM control transformer (part# HT01CN236) is the factory-specified replacement for the Carrier FB4ANF048008AFAA air handler. The transformer steps down 120V line voltage to the 24V signal required by the thermostat, control board, contactor coil, and all low-voltage control circuits. When it fails, the thermostat goes completely dark, the system makes no response to any call for heating or cooling, and downstream 24V components receive no power — making it one of the most impactful single-component failures in the system.

  • Specs: 40VA rated | Primary: 120V | Secondary: 24V | Factory-matched impedance and thermal protection | OEM part number HT01CN236
  • OEM vs Generic: This OEM unit is wound and thermally protected to Carrier's exact specifications. Generic transformers frequently underperform on VA capacity, causing nuisance tripping and overheating under normal control circuit loads — especially in multi-stage or multi-zone systems.
  • Install difficulty: 2/5 — Shut off power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper, needle-nose pliers. Photograph all wiring connections before removal.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier FB4ANF048008AFAA air handler. Always verify primary voltage on your unit's data plate matches 120V before ordering. If your system runs on 208/240V primary, do not install this unit. Our fitment team is available to confirm compatibility before you order — same-day shipping ensures you're 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 $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 FB4ANF048008AFAA?
Yes. This is the factory-specified OEM transformer for the Carrier FB4ANF048008AFAA. 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 FB4ANF048008AFAA?
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