Question about Rancilio Silvia Espresso Machine
The pump is a vibratory pump on rubber mounts. It makes a loud buzz when running.
The pump makes a knocking sound when it is out of place on the mounts and banging into something and when the pressure is high (water flow is blocked)
Open the wand all the way (no back pressure) and make some hot water. If the noise changes to a quiet hum, get a warranty repair. If the noise changes some but is still a knock, take out the water reservoir and the pump shield.
You can see the shield by looking down into the cavity left by the reservoir. One screw hold the shield in place. Remove the screw and the shield, and wiggle the pump around in its mounts until it does not bump into anything when running. Then replace the shield, screw and reservoir.
Posted on Jun 08, 2014
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Posted on Jan 02, 2017
SOURCE: Loud Knocking
If the noise is not coming from the fan as Buffalo suggests, it is most likely the expansion and contraction of the heat exchanger. The old school way to lessen the noise of expansion is to bank the combustion chamber with a hammer. I don't recommend it today because the metal is so thin (thus all the noise) and you may damage it. You will get used to it and the noise may soften the more it is used. You will never get it to stop.
Posted on Dec 04, 2007
SOURCE: loud noise
My Silvia was doing something similar to this after no less than 2 weeks of operation.
Not being too worried about the warranty for just opening the case and looking inside......I did so. Be careful. Unplug as you remove various panels. Just don't touch anything with wires. You can see your problem if it is the same that I had.
Remove water res. Remove SS top. To view the pump, I had to remove the SS shield separating the reservoir from the boiler area. You will find the pump attached to the bottom of the chassis. It is supported by a rather flimsy rubber mount. Mine was collapsed to one side.......and the pump was literally banging against the chassis. Yes.....that will rattle your cups sitting atop the machine. To prove that your pump is not held securely in its mount, actuate the ON switch and observe the pump. Use only short burst of power when viewing your pump as you are NOT pushing water thru the assembly....and of course, all those electrical shock hazards that exist.
If it is shaking side to side......that is your problem.
I took a piece of hot water pipe insulation that I had out in the garage and cut it to the length from pump fitting to exterior wall of cabinet. I think that might have been about 4.25 inches (I fixed this problem over two months ago and can't remember the actual length). The insulation piece is very light and holds the pump quite securely in place precluding the side to side vibration and the terrible noise. The split in the insulation allowed for the water line to be held securely as it comes out of the pump.
Reinstall all shielding parts, etc.......and you should be back on your way to minimal pump noise espresso shot pulling!!
All the best........Arch in Virginia Beach
Posted on Apr 13, 2008
Well you may want to have a tech come out and check the freon level, but mostly when going into defrost, some units make alot of noise, the freon is reversed in the unit by way of the reversing valve, it makes a whooshing sound like freon is draining off, as far as the knocking noise, could be as I said in the beginning, might be low on freon, but it could be that, this particular unit does this, I have had units make some really strange noises in the past but functioned perfectly, hope this helped, please let us know, thanks again,
Posted on Jan 24, 2009
Posted on Mar 30, 2009
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