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OEM Lennox Fan and Limit Control — 11M40
Lennox

OEM Lennox Fan and Limit Control — 11M40

SKU: LNX-11M40 Brand: Lennox
$19.95 $28.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 11M40 fan and limit control is a dual-function device that manages both blower operation and overheat protection in your Lennox furnace. It senses plenum temperature to energize the blower once the heat exchanger is warm and de-energize it after the burners shut off, while its integrated high-limit function cuts the burners if temperatures ever exceed the safe threshold.

Common failure symptoms: When the 11M40 fails, you may notice the blower running constantly or not starting at all, cold air blowing at the start of a heat cycle, furnace short-cycling, or safety lockouts on overheat. A control that is out of calibration disrupts proper fan timing and comfort.

Why OEM matters: Because the 11M40 combines blower timing and critical safety limits in one calibrated unit, using the genuine Lennox part is essential. Aftermarket controls may not match the correct fan-on/fan-off setpoints or limit trip temperature, risking poor performance or compromised safety. The OEM part guarantees exact fit and factory-rated 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 Limit Switch fit my Lennox OEM Lennox Fan and Limit Control — 11M40?
Yes. This is the factory-specified OEM limit switch for the Lennox OEM Lennox Fan and Limit Control — 11M40. 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 limit switch on my Lennox OEM Lennox Fan and Limit Control — 11M40?
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 limit switch?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this limit switch 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 limit switch?
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.
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Mike Rivera
HVAC Parts Specialist — Online