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

Menu

Home Shop All Account Cart

IMAGE COMING SOON

Lennox

OEM Lennox Nordic Fast-Stat 3000 Wiring Extender 3 Functions 1-Wire — 77X65

SKU: LNX-77X65 Brand: Lennox
$19.95 $29.95

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The Lennox 77X65 is an OEM Nordic Electronics Fast-Stat 3000 wiring extender that allows three thermostat control functions to operate over a single existing wire, eliminating the need for costly rewiring in retrofit or upgrade installations. This innovative solution is ideal for Lennox system installations where additional thermostat wires are not available, enabling features such as fan control, heating, and cooling over one conductor. If you are experiencing limited thermostat functionality due to insufficient wiring, the 77X65 Fast-Stat 3000 provides a reliable, code-compliant solution compatible with Lennox HVAC systems.

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 Wiring Harness fit my Lennox OEM Lennox Nordic Fast-Stat 3000 Wiring Extender 3 Functions 1-Wire — 77X65?
Yes. This is the factory-specified OEM wiring harness for the Lennox OEM Lennox Nordic Fast-Stat 3000 Wiring Extender 3 Functions 1-Wire — 77X65. 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 wiring harness on my Lennox OEM Lennox Nordic Fast-Stat 3000 Wiring Extender 3 Functions 1-Wire — 77X65?
Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.
What symptoms mean I need a new wiring harness?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this wiring harness compatible with Bryant or Payne too?
Many Lennox 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 Lennox wiring harness?
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