Shop vac 90L400 stopped working won't start
I had the same problem with the same model. Turned out to be the thermal fuse on the motor housing, between the switch and the windings. Took it apart and replaced the melted solder with 14 guage copper wire. Works fine! No thermal protection but I don't use it for long at a time anyway. Check the switch for continuity, if good then check the thermal fuse for continuity. If good, it's the motor.
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