Troubleshoot a stuck blower fan by checking and adjusting the furnace fan limit control, including dial settings, calibration, and sensor condition to fix continuous blower issues. Learn how to set the blower on temperature to about 120°F and the blower off temperature to between 85°F and 90°F, verify plenum temperature with a handheld thermometer, make small five degree adjustments, and know when to replace a corroded or failing fan limit switch. This HVAC troubleshooting guide covers furnace fan control problems, blower motor troubleshooting, fan limit switch replacement, common causes of continuous blower operation, and practical tips for homeowners and DIYers to diagnose and repair older heating systems.
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fan limit control, blower won't turn off, furnace fan troubleshooting, fan limit switch replacement, continuous blower fix, plenum temperature check, blower on off settings, HVAC DIY tips, furnace blower troubleshooting, fan limit calibration
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