This, already 54 in a row, question with just such a heading was asked by the reader Alexander. And I continue to publish for the "question-answer" section. Let me remind you that if you have your own answer to a question, then write it in the comments below. I and other readers will be happy to read it.
I quote the text of the question verbatim:
Hello! Such a question: I bought an apartment in a new building, in general, the wiring throughout the apartment is normal, good distribution / meter in 2018. Copper wiring is everywhere. I started to connect an exhaust fan in the shower / toilet, there is a three-pin cable from the developer in the ventilation mine. The colors are blue, brown, earth. The fan is not humming (it itself is normal). I measured the contacts with a tsyoshka, it shows 3.5 volts at recess. What could be the problem?
I reviewed the issue and advised Alexander within the framework of my knowledge and qualifications as follows:
Good afternoon!
You claim that the fan is working, I have a counter question - how did you check it. If you just connected to another power source, and it works, it is accepted. If you just tried to rotate the blades by hand, then this indicates solely that the shaft of the electric machine is not jammed.
Among the most likely causes of a malfunction, the following should be highlighted:
- if the device was already in use, a backlash could occur, due to which dust was collected;
- a misalignment could occur, due to which the shaft of the electric machine cannot move;
- could burn out the wires of the windings of the electric motor, as a result of a short circuit, there was defect in power and the engine has too little torque to move it from places;
- in engines with a starting or working capacitor, the latter could fail - for repair, the capacitive element simply changes;
- garbage is wound on the shaft, preventing it from turning in the right direction; to eliminate it, it is enough to clean the unit and continue to enjoy its work.