There is no electricity to my ensuite bathroom

There should be a fuse or breaker that would turn that off. It should be on one circuit by its self for the bathroom heating system. If its a breaker just flip the breaker switch.

sometimes, a GFI will be controlled by another GFI. Did you "reset" the GFI ( if there is one ) in the bathroom? You have to find out where
The wires in the dead GFI come from. Electrical panel....circuit breakers. Did you flip each circuit breaker off then on to reset them ?
Do you have an electrical meter ? let me know then we will go from there.

I recommend you check your main panel for a tripped circuit breaker. If no tripped circuit breaker, check your gfci outlet in the bathroom (or sometimes in another bathroom like your ensuite). It could be tripped. Reset it. if it is not tripped, I would check the hall outlet for a bad connection, being careful to ensure power is off when taking apart. If not comfortable doing that safely, contact an electrician who will likely solve the problem with a service call.

may need a backflow preventer in the waste line under the sink..it is basically a ball on a spring..designed to make the water go only one way..I am guessing the wasteline was opened up with a plumbing snake..that pump may have too much backpressure from the head line..

This is the car and truck section, but you might try youtube for videos.

Ensuites are designed to provide you with a private room or as a toilet or shower cloak. Ensuites are available in either single or double size and come with a unit supported with poles. There are some ensuites with features like removable roof for use with a solar shower, removable floor, storage for toiletries, hook for a light and mesh windows.

If some taps have really hot and others luke warm, then you might have defective mixing valve, check valve, or crossover on single handled faucet.
http://waterheatertimer.org/Crossover.html

Crossover can also cause stacking event. Stacking could be part of puzzle.
http://waterheatertimer.org/Stacking.html

Once crossover or check valve or mixing valve problem is solved, if you have really hot water to some taps, then turn down thermostat to avoid scalding.
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

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yes, you may need to get a rebuild kit, I bet that some of the o-ring seals are wearing out.

If you mean that it self activates then the non-return valve is at fault by the sound of what you say

Hi
We have sealed leaking extractor fans with clear sealant,advised after calling the manufactures (it was out of guarrante)