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 Sequencer (Time-Delay Relay) — 72F83

SKU: LNX-72F83 Brand: Lennox
$24.95 $34.95

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 72F83 sequencer is a time-delay relay that staggers the energizing of electric heating elements in your Lennox furnace or air handler. By bringing heat strips online in sequence rather than all at once, it prevents a large inrush current surge, protects the electrical circuit, and delivers smooth, even heat output.

When a sequencer fails, common symptoms include no heat or insufficient heat, elements that never energize, a breaker that trips on startup, or heat strips that stay on after the call for heat ends. A stuck-open contact leaves elements cold, while a stuck-closed contact can keep them energized and create a safety concern.

Installing the OEM Lennox 72F83 guarantees the correct timing curve, contact ratings, and coil characteristics your system relies on for safe staged heating. Generic substitutes with different delay times or amperage ratings can cause nuisance breaker trips or premature element burnout. The factory-matched part restores reliable, code-compliant electric heat operation.

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 Relay fit my Lennox OEM Lennox Sequencer (Time-Delay Relay) — 72F83?
Yes. This is the factory-specified OEM relay for the Lennox OEM Lennox Sequencer (Time-Delay Relay) — 72F83. 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 relay on my Lennox OEM Lennox Sequencer (Time-Delay Relay) — 72F83?
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 relay?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this relay 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 relay?
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