Fixing the Heating at the Lab

It was warm downstairs, and cold upstairs, so I knew the circulator pump was not working.  Using my handy voltmeter, I saw that power was going to the motor, so it was not the control circuitry.  An online order for new pump, and 2 days later it was waiting for me.  Rusty, old, broken on the left, shiny new happy circulator on the right.  Nice being able to fix things.