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Lennox Limit Switch 49K71
This part 49K71 is compatible with:
- Product Type:
- Air Conditioner, Central Air Conditioner, Furnace
- Brands:
- Lennox
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Limit Switch Customer Reviews
Common Problems Fixed by the Limit Switch
Based on customer reports and repair data, this part commonly fixes these issues:
Furnace starts then stops
Air handler not heating
Air handler blower runs all the time
Furnace is frequently cycling/short cycling
Air handler is frequently cycling/short cycling
Furnace not heating
About the Limit Switch
The flame rollout limit switch monitors the heat surrounding the burners. If the inducer fan motor cannot draw enough air through the burners, or if the furnace is not venting properly, the rollout limit switch will open to halt the ignition sequence and prevent the furnace from heating. When this happens, the furnace will shut off after running for a few minutes. To determine if the flame rollout limit switch is defective, use a multimeter to test it for continuity. If the switch does not have continuity, replace it. Be aware that poor airflow through the burner is often a result of insufficient ventilation or a restricted exhaust vent. Make sure that your furnace is in a properly ventilated location and the exhaust vent is clear of obstructions.
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Alternative Part Number(s)
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