Sounds like a bad blower fan switch relay or limit switch.
Furnace blower motor relay test.
Blower motor relays tend to wear out over time from the.
Essentially an on off switch the blower motor relay s reactions start and end the heating process in hvac systems by controlling the flow of current between the power source and the motor.
I go over how to read the ratings for time how to.
Hvac blower fan test diagnosis faqs q a on fixing the air handler fan questions.
Hvac blower fan testing diagnostic questions answers.
Reader questions responses help.
The relay by the fuses clicks when i turn the fan control knob from 0 to 1.
This video will show you how to properly diagnose your blower by using the multime.
The blower motor is crucial to the proper functioning of your hvac system.