What are the specs for this Control Board?

The correct replacement for Lennox model OEM Lennox IMC HP1-2 Control Replacement Kit — 81L77 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 IMC HP1-2 Control Replacement Kit — 81L77.

Lennox

OEM Lennox IMC HP1-2 Control Replacement Kit — 81L77

Name: OEM Lennox IMC HP1-2 Control Replacement Kit — 81L77
Brand: Lennox
SKU: LNX-81L77
Price: 39.95 USD
Availability: InStock

SKU: LNX-81L77 Brand: Lennox

$39.95 $54.95

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The Lennox 81L77 is a genuine OEM IMC HP1-2 Control Replacement Kit that manages heat pump operation within the Lennox Integrated Modular Control platform. This control board governs heat pump staging, defrost cycles, reversing valve operation, and compressor sequencing, coordinating heating and cooling modes for efficient, reliable performance.

Common failure symptoms: When the HP1-2 control fails, you may notice the heat pump failing to switch between heating and cooling, missed or excessive defrost cycles, ice buildup on the outdoor coil, a compressor that won't stage properly, or fault codes on the IMC display. Electrical surges, moisture, and age are typical causes.

Why OEM matters: Heat pump control logic must match your Lennox equipment's defrost timing, staging thresholds, and communication protocol exactly. The genuine OEM 81L77 is factory-configured for the IMC HP1-2 application, ensuring correct operation that aftermarket boards cannot reliably replicate. Installing the correct OEM control kit protects efficiency, prevents nuisance faults, and safeguards your Lennox warranty.

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 IMC HP1-2 Control Rep...

$39.95

Frequently Asked Questions

Does this Control Board fit my Lennox OEM Lennox IMC HP1-2 Control Replacement Kit — 81L77?

Yes. This is the factory-specified OEM control board for the Lennox OEM Lennox IMC HP1-2 Control Replacement Kit — 81L77. 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 IMC HP1-2 Control Replacement Kit — 81L77?

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 IMC HP1-2 Control Replacement Kit — 81L77

Shipping Information

Return Policy

Frequently Asked Questions