How do i servis a glowworm compact boiler

Check the pump is no seized

Check if you have the link still in place, it seems its wired incorrectly through the bus circuit remove link and re wire

You're probably getting what some call gurgling sounds because there is air in the system. You need to bleed the air out at all bleed ports starting with the lowest in the system and ending with the highest.It won't hurt if you do that process a couple of times. Once all the air is out, you should have a normal convection flow of water through the system. - Good luck!

Contact a qualified heating engineer,they will sort it properly.

All the combis I've come across merely fail to fire if the pressure is not up. not only do they not fire, nothing else works including the pump and in any event the pump should not overheat just on low pressure.
water loss - try turning off the valves on the flow & return pipes [3/4 inch ones] 1 valve per pipe . This will isolate the rest of the system - rads etc Note pressure over a time period. In this mode the hot water circuit will still work but do NOT use the heating circuit
1/2 bar over 2 days is not serious but it should be found
Once you have either mended the leak in the rest of the system or found there is not one, insist on a replacement boiler
In any event having looked at the reasons given for the fuse blowing, I would definitely get a replacement.
These problems should not happen on a new boiler
I list Worcester.-Ariston-GlowWorm-Ideal- and many others who would confirm this

Under the boiler a little right of center there is a blue/other colour knob. Turn this anticlockwise [as you look up] [twist from right to left] This is the mains inlet tap to let water into the boiler and create the pressure shown on the guage 0.5 bar is the absolute nin.
allow the water to flow in until the guage reads about 1 bar then turn off the knob -not too tight as these are plastic
If you allow too much pressure- do not worry, there is an automatic relief valve.
If the boiler persists in loosing pressure, look for a leak in all pipes to & from radiators. If no leak then check the pressure relief valve outlet pipe, it usually goes through the wall to the outside. Look at the end for water drips & if there are drips replace valve

{ Glowworm} any merchant will order you one best of luck

refere to glowworm expert advise

electric boiler- or other ?

this is a drain valve -like a water tap just close clockwise firmly -please advise me - there are some things you have to do now- please respond asap