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OEM Carrier Transformer 40VA 120V/24V for C4850C48ZG035200
Carrier

OEM Carrier Transformer 40VA 120V/24V for C4850C48ZG035200

SKU: CARRIE-C4850C48ZG035200-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C48ZG035200

This OEM control transformer (part number HT01BD236) is the factory-specified replacement for the Carrier C4850C48ZG035200 packaged unit. The transformer steps down line voltage (120V primary) to the 24V secondary signal used by the control board, thermostat, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat communication, no contactor engagement, and no heating or cooling output whatsoever.

  • Specs: 40VA rated | 120V primary / 24V secondary | Factory-matched OEM tolerances | Replaces OEM part number HT01BD236
  • OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact VA and voltage specifications. Generic transformers with underrated VA capacity can overheat under full control-circuit load, causing repeated nuisance failures and potential damage to downstream boards and thermostats.
  • Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph existing wiring connections before disconnecting. Verify 24V output with a multimeter after installation before restoring full system power.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier C4850C48ZG035200 packaged unit. Confirm your unit's control circuit voltage and VA requirements match 120V/24V 40VA before ordering. Cross-reference OEM part number HT01BD236 on your unit's wiring diagram or data plate for exact fitment. Have questions about compatibility? Our HVAC parts specialists verify fitment before you buy — no guesswork required. Order today and your part ships the same business day.

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 C4850C48ZG035200?
Yes. This is the factory-specified OEM transformer for the Carrier C4850C48ZG035200. 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 C4850C48ZG035200?
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