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Hi if there is Vapor coming from the grouphead when the lever is down then I would guess there is a problem with the seals around the piston and possibly elsewhere. Here is a link to a goos site that looks at repairing La Pavoni lever machines. Good luck. DIY
If you have a La Pavoni lever model espresso machine and the safety assembley on the top right hisses while the machine is heating up, all you have to do is use something hard but preferably not metal or too large and tap the safety assembly quite firmly but not to hard and this should stop the hissing. This is because inside the assembly there is a bung on a spring and sometimes it becomes stuck and just needs a gentle tap to free it up. If it doesn't stop hissing then you can remove and stretch the spring or if needs be replace the spring and bung.
Hi there, i am Mr La Pavoni based in Glasgow, Scotland and i will be able to help you. If you know the parts you require then i think you would be best to replace them as if it keeps blowing fuses then it may cause more damage than you would like. If you go to www.theespressoshop.co.uk you can buy every individual part for the lever models online and they send very quickly too. If you need further assistance please don't hesitate to get in touch with me at firstname.lastname@example.org
It seems to me that your pressure stat which is inside the base of your machine needs replacing. I would try to give it a good descale and if this doesn't do the trick then a new pressure stat is what you need. Prob around £20 if you buy it and do it yourself. www.theespressoshop.co.uk and just click on the little la pavoni machine for full parts list.
check the diaphragm of presurestat, it might be to old and non sensitive, measure the cirquit at presurestat. does he open the cirquit when it is at 1.5 bar pressure(you can test it with air, no need to be built in machine)
if presurestat works properly than check the heating element, he can take phase directly and heat in conection with grownd if it is broken, than you cant stop it he heats to infinitive. in this case you replace the heating element.
as i said solution is either pressurestat or heating element.