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Lennox

OEM Lennox Freeze Protection Control (FPC) — 34N04

SKU: LNX-34N04 Brand: Lennox
$39.95 $54.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 34N04 is an HN freeze protection control (FPC) for Lennox HVAC systems. It monitors coil and refrigerant temperature and interrupts compressor operation when conditions could cause the evaporator coil to freeze — protecting the coil, compressor, and refrigerant charge from the damage that a freeze-up or low-temperature fault can cause.

Common failure symptoms: A faulty 34N04 may allow the coil to ice over during cooling, cause the compressor to shut down for no clear reason, produce nuisance freeze lockouts even in normal conditions, or leave the system with weak cooling and poor airflow. Erratic compressor cycling tied to temperature is a telltale sign the freeze protection control needs replacement.

Why OEM matters: Freeze protection thresholds are matched precisely to Lennox coil design and refrigerant behavior. A generic control with different trip points can either freeze the coil or lock out the compressor unnecessarily. The factory 34N04 delivers the correct setpoints, exact terminal layout, and dependable freeze protection your Lennox equipment was engineered to use.

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 Control Board fit my Lennox OEM Lennox Freeze Protection Control (FPC) — 34N04?
Yes. This is the factory-specified OEM control board for the Lennox OEM Lennox Freeze Protection Control (FPC) — 34N04. 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 Freeze Protection Control (FPC) — 34N04?
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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Mike Rivera
HVAC Parts Specialist — Online