What are the specs for this Control Board?

The correct replacement for Lennox model OEM Lennox M2 BACnet Replacement Kit — 59W51 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 M2 BACnet Replacement Kit — 59W51.

Lennox

OEM Lennox M2 BACnet Replacement Kit — 59W51

Name: OEM Lennox M2 BACnet Replacement Kit — 59W51
Brand: Lennox
SKU: LNX-59W51
Price: 39.95 USD
Availability: InStock

SKU: LNX-59W51 Brand: Lennox

$39.95 $54.95

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The Lennox 59W51 M2 BACnet replacement kit (factory part number 102635-01) is a genuine OEM control module that provides BACnet building-automation connectivity for compatible Lennox equipment. It serves as the M2 communication interface, letting a building automation system read status and issue commands for heating, cooling, ventilation, and economizer functions while reporting alarms and diagnostics back to the front end.

Common failure symptoms: When the M2 BACnet module fails, you may see loss of network communication, offline points at the BAS, unresponsive remote setpoints, missing alarm and runtime data, or unit control reverting to local-only operation. Electrical surges, moisture intrusion, and component aging are typical causes of failure.

Why OEM matters: Reliable BACnet integration requires matching firmware and object mapping specific to Lennox controls. The OEM 59W51 kit is factory-validated for correct communication and configuration — aftermarket alternatives can introduce mapping errors, dropped data points, and integration downtime. Choose the genuine Lennox part for consistent, supportable automation. In stock and ready to ship same 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

OEM Lennox M2 BACnet Replacement...

$39.95

Frequently Asked Questions

Does this Control Board fit my Lennox OEM Lennox M2 BACnet Replacement Kit — 59W51?

Yes. This is the factory-specified OEM control board for the Lennox OEM Lennox M2 BACnet Replacement Kit — 59W51. 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 M2 BACnet Replacement Kit — 59W51?

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.

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OEM Lennox M2 BACnet Replacement Kit — 59W51

Shipping Information

Return Policy

Frequently Asked Questions