What are the specs for this Control Board?

The correct replacement for Lennox model OEM Lennox Control Board (LB-87032) — 73J17 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Lennox equipment which lists the model number OEM Lennox Control Board (LB-87032) — 73J17.

Lennox

OEM Lennox Control Board (LB-87032) — 73J17

Name: OEM Lennox Control Board (LB-87032) — 73J17
Brand: Lennox
SKU: LNX-73J17
Price: 39.95 USD
Availability: InStock

SKU: LNX-73J17 Brand: Lennox

$39.95 $54.95

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The genuine OEM Lennox 73J17 control (factory reference LB-87032) is the electronic brain that coordinates the operating sequence of your Lennox HVAC system. It manages inputs from thermostats, sensors, and safety switches, then relays commands to the ignition, blower, and other components so the unit cycles safely and efficiently. As a factory-specified board, it is engineered to the exact voltage, relay, and connector layout your equipment expects.

Common Failure Symptoms

System fails to start or randomly shuts down mid-cycle
Error or fault codes on the diagnostic display
Blower, ignition, or staging outputs not responding
Intermittent operation, tripped safeties, or no response to the thermostat

Why OEM Matters

Aftermarket or salvaged boards frequently use different firmware, relay ratings, or pinouts that can cause nuisance faults or fail to control your system correctly. The OEM Lennox 73J17 guarantees correct fit, verified board revision, and full compatibility with your unit's control logic — protecting the components it manages. Choosing genuine Lennox parts preserves rated performance and avoids the callbacks that come with generic substitutes.

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

OEM Lennox Control Board (LB-870...

$39.95

Frequently Asked Questions

Does this Control Board fit my Lennox OEM Lennox Control Board (LB-87032) — 73J17?

Yes. This is the factory-specified OEM control board for the Lennox OEM Lennox Control Board (LB-87032) — 73J17. 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 control board on my Lennox OEM Lennox Control Board (LB-87032) — 73J17?

Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.

My HVAC system is completely dead. What could be wrong?

Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.

Is this control board 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 control board?

OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.

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.