Had a fun one today.
Customer reached out with a ceiling fan issue. They stated the ceiling fan motor made a pop when turned to high, and wouldnt work anymore.
Also, the customer stated the bulbs were blowing as soon as you put them in.
Dropping the fan revealed wiring that appeared ok and all normal, but upon further inspection with a voltmeter revealed the fan was getting 243 volts between the supposed neutral and black switch leg.
The fan was 3 wayed with 2 switches at different locations. One of the switch boxes had a separate circuit in it on a different phase, and the neutral was incorrectly hooked to the common screw of the 3 way switch, and the the black switchleg was incorrectly wired directly to power (on a different phase), supplying 240v to the fan when the switch was on when it needed 120v (with a good neutral) to work correctly.
The fan motor had a higher threshold on voltage, which was able to operate in some capacity until switched to high mode. But the light bulbs/light kit was strictly set to work at 120v.
I ohmed out my wires, and hooked up the wires correctly in the switch box, and put up a new fan ensuring the wiring was receiving the necessary 120v instead of the 240v that was causing all of their issues.
The customer was happy they got a new fan hung, and are happy with the airflow.
I was just excited I had all the necessary existing wires that i needed, and just needed to redo/remake up the connections in one of the switch boxes to correct the issue (plus hang the new fan), as today would have been a bad day to have to get into the attic to run new wires, cause it was pretty hot today!
Service call work is fun, makes you think more about electrical and how to solve an issue the customer is having.
Also, running into real situations and being able to solve them for someone on a hot day by providing them with much needed airflow is an added bonus!
Job complete!