I decided to fill up some water (so the drag on the pool cover is reduced).
I also ran the pump and added chlorine.
I forgot about this for 2 hours and the water filled up quite high (not overflowing though). Last rain season the water was even higher.
Then I noticed the pump was not running even though it was switched on. I have one of the old mechanical switch (mechanical timer).
I checked the power panel to ensure it was not tripped.
I am not sure where to start. Is there anything else I can do before calling in an electrical or pool guy ?