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Re: rancilio class 6 E compact authomatic spilling water
check the solenoid valve and electronic comand for boiler filing. solenoid valve could be leaking, electronic part could have weak contact with level detector wire or relay (driver of solenoid valve and motor) has bad contacts, and does not open circuit circuit remains all the time closed.
check the presurestat, be sure that he opens cirquit at 1.5 bar snd does not angage heating element to heat up more.
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First thing check the manual fill under drain tray to make sure it is in the off position, next check the water level in the sight glass, I will assume the machine has a level probe connected to the boiler and not the level card on the sight glass. Next check the inlet valve. If water comes into the boiler without stopping when the machine is turn on and it overfills then the connection on the level probe is missing or the inlet solenoid is not closing and needs to be checked for blockage.
You can do one or two things; 1 - Increase the pressure stat to 1.3 bar, 2 - Raise the water level in the boiler for more thermal mass so that you do not lose as much heat when the machine adds water to the boiler.
Adjust the grind of the coffee you are using finer, I don't know what type of grinder you are using but I will assume it is a commercial one. Adjust it about 2 numbers towards fine that will be a good start.
There is a max fill line mark on the side of the water tank. Fill the water to there or less. Do not fill the water any higher than this line or water will spill out the side where the water inlet hoses run. Also make sure that the tank is not cracked and leaking water.
The pump may have some scale making the impeller stick. First remove it and attempt to turn the impeller shaft with a pliers. You may be able to unstick it. If not, you will need to use an aggressive descaler that you should completely soak the pump in. 50% muriatic pool acid is what I use. If after this, the impeller shaft will not budge with a pliers, your pump is no good and this is a very common problem in machines that sit. You will have more scale problems from that machine sitting, so get ready.