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Lennox 73W18 Auto Limit Switch 120°F-150°F

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Special Price $37.77 Regular Price $49.10
In stock
SKU
73W18
The Lennox 73W18 Auto Limit Switch is an essential safety device required in several HVAC equipment, including furnaces and air handlers. It also acts as an overheat cut-off switch commonly at temperatures between 120°F and 150°F. Through the ability to detect temperatures that are above a specific set threshold, it protects the equipment from being damaged by heat. This small part has included that, it keeps the system safe and helps to prolong the service life of the HVAC equipment.
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HVAC Controls, HVAC Limit Switch
Manufacturer:
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Specifications

  • Weight:0.07lbs
  • Measure: Unit
  • Temperature: 120°F to 150°F
  • Type: Limit Control - STILT
Manufacturer Name: Lennox
Product Number: 73W18
OEM Part Number: 73W18
Product Description: 120-150F Auto Limit Switch
Weight:0.07lbs/31.75g

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Product Questions (2)
Customer Questions
What maintenance is required for the Lennox 73W18 Auto Limit Switch?

Inspect wiring connections regularly and ensure terminals remain tight and free of corrosion. Keep the switch clean and verify temperature response to avoid premature tripping or failure. Replace or recalibrate if it shows inconsistent cut-off actions or signs of overheating.

What are common issues with the Lennox 73W18 Auto Limit Switch?

  • Inaccurate temperature sensing causing early or delayed cut-off.
  • Worn contacts leading to intermittent switching.
  • Loose or damaged wiring connections causing power interruptions.
  • Failure to reset after tripping under high heat conditions.

Installation Steps

Step 1: Turn off HVAC power at breaker and verify no voltage.

Step 2: Remove access panel and locate existing limit switch on furnace.

Step 3: Disconnect wiring, label terminals for reference to ensure correct reconnection.

Step 4: Install new switch in same position, secure mounting ensuring proper airflow alignment.

Step 5: Reconnect wires per labels/schematic and tighten securely.

Step 6: Restore power and test temperature cut-off, monitor operation for proper cycling.