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 to 24V for C4850C48ZN070500 — Ships Today
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C4850C48ZN070500 — Ships Today

SKU: CARRIE-C4850C48ZN070500-TRANSFORMER-HT01BD236 Brand: Carrier

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Transformer 40VA 120V to 24V for Model C4850C48ZN070500

This is the OEM factory-replacement control transformer (part number HT01BD236) for the Carrier C4850C48ZN070500 packaged unit. The transformer steps line voltage (120V) down to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and all safety controls. When the transformer fails, nothing in the control system responds: the thermostat goes blank, the unit won't energize, and no error codes are produced because the board itself has no power. A failed transformer is often caused by a short or overload in the 24V circuit, so always inspect low-voltage wiring before installing a replacement.

  • Specs: Primary: 120V AC | Secondary: 24V AC | VA Rating: 40VA | OEM Part Number: HT01BD236 | Replaces factory-installed transformer on Carrier C4850C48ZN070500
  • OEM vs Generic: This is the genuine Carrier OEM transformer, wound to factory VA and voltage tolerances. Generic transformers often run off-spec under load, causing nuisance lockouts or premature burnout of the control board.
  • Install difficulty: 2/5 — Disconnect power at the breaker before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm 120V primary and 24V secondary output with a multimeter after installation before re-energizing the full system.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C4850C48ZN070500 packaged unit. Verify your unit's control voltage requirements and transformer mounting configuration against your data plate before ordering. Our fitment specialists are available to confirm compatibility prior to purchase — don't guess on control circuit components.

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 C4850C48ZN070500 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C48ZN070500 — 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 C4850C48ZN070500 — 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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online