Welcome to CoffeeSnobs..... [smiley=thumbsup.gif]
These little beauties really are the "Wolf in Sheeps Clothing" of espresso machines.... An awful lot of capability built in to a very compact little(31Kg ::)) package. Youll have to post up some photos so that we can all drool over your newly found acquisition ;).
Just to address your queries as theyve been asked....
The Boiler "Auto-Fill" is taken care of by a set of immersion probes and the Gicar Electronic Control Box. Its possible that the Boiler Probes may be caked up with scale (especially the high level one which is supposed to turn the pump OFF). Hopefully the Gicar Box is OK as these are quite expensive to replace but easily repaired if you know a friendly Electronics Tech., or one who is amenable to bartering his/her services for some fresh coffee.
More than likely though, when you descale the Boiler, Heat Exchanger, Element and the immersion probes; this will solve your problems.
Just on descaling.... I would highly recommend that you use a product called "Clean Machine" available through several of our sponsors and distributed by another of our Site Sponsors, "Bombora". This product leaves plain Citric Acid for dead in my opinion and have no hesitation recommending it to others. Very economical too.
Regarding water pressure.... Its highly advisable to install a "Pressure Control Valve" to regulate water supply pressure to a maximum of 350kpa. Once again, you can acquire these from one or more of our site sponsors, and maybe stores like Bunnings and specialist plumbing supplies outlets (typically cost around the $100 mark). This will ensure that despite the cyclic operation of the main pressure pump, the water pressure to your espresso machine should remain reasonably constant. Do you know the Cut-In and Cut-Out pressure settings of the main water pump? Ideally, the Cut-In pressure should be higher than the setting of the pressure control valve.
By the way, is the water tank filled with rain-water or from some other source? If you think theres a chance that highly mineralised water is going to be an issue, it will also pay to install a suitable filter system downstream of the PCV. If using rain-water though, this shouldnt be a problem but it still might be a good idea to install a particulate filter to catch anything picked up by the main pump. There are a lot of very small orifices in the espresso machine which are easily blocked, so is food for thought.
Dont know that the machine need to be perfectly level to function acceptably but should be reasonably level, all the same. I guess this can be accomplished via the use of some suitably sized packing shims under the machines feet. Ive replaced the feet on my machine so I guess if you wanted to go to that extent, you could buy some adjustable height feet from our good friends at "CoffeeParts" and fit those. This would enable you to level the machine very easily.
Hope that helps you out "tbc". Keep in touch with your progress.... :)