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Rancilio Silvia Won't Stop Heating
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Discussions > Espresso > Machines > Rancilio Silvia...  
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samstone
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Posted Sat Oct 5, 2013, 11:39am
Subject: Rancilio Silvia Won't Stop Heating
 

Searched and Searched but have found nothing in this issue.  My Rancilio Silvia boiler doesn't stop heating.  I've replaced all three thermostats and the main power switch.  It heats, only too well.  The boiler runs until steam blows out the head when you turn the pump on.  Needless to say I've unplugged the machine to prevent an explosion.  Is this the sign of a bad heating element?  Any advice greatly appreciated.
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Frost
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Posted Sat Oct 5, 2013, 12:29pm
Subject: Re: Rancilio Silvia Won't Stop Heating
 

Is it possible you have put the steam thermostat in place of the brew thermostat?
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samstone
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Posted Sat Oct 5, 2013, 12:50pm
Subject: Re: Rancilio Silvia Won't Stop Heating
 

don't think so.  It was behaving like this to start so i assumed thermostat problem.  since i could get them for $15 each, i figured might as well replace all three while i was in there (on the theory that if one went bad perhaps one or both of the others might go soon).  I replaced each one at a time, and the brew thermostat is marked to make it obviously different from the steam.

FWIW, I but a multimeter on the boiler leads and it read 16-20 with the meter on the 20K range (ohms), which from what I'm reading would not be good.  What I can't figure out is why the element would not shut off with new thermostats once it heated too much.

totally confused.
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Frost
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Frost
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Posted Sat Oct 5, 2013, 1:30pm
Subject: Re: Rancilio Silvia Won't Stop Heating
 

Hmm, maybe the steam switch has failed closed? (just thinking out loud; this bypasses the brew thermostat)
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samstone
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Posted Sat Oct 5, 2013, 5:28pm
Subject: Re: Rancilio Silvia Won't Stop Heating
 

Would disconnecting that switch cause it to be "off" in order to test?
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Frost
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Frost
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Posted Sun Oct 6, 2013, 8:20am
Subject: Re: Rancilio Silvia Won't Stop Heating
 

samstone Said:

Would disconnecting that switch cause it to be "off" in order to test?

Posted October 5, 2013 link


I would just test the switch with a meter, machine unplugged and switch out of the circuit.
I don't know the wiring particulars of Silvia; what else the switch might control (3-way?)
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SStones
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Posted Sun Oct 6, 2013, 3:04pm
Subject: Re: Rancilio Silvia Won't Stop Heating
 

You're going to need to check the element for a short to ground. That's the most likely possibility if you have all new thermostats.  Sorry.
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samstone
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Posted Mon Oct 7, 2013, 9:49am
Subject: Re: Rancilio Silvia Won't Stop Heating
 

how would I check short to ground?  multimeter across teh heating element terminals?  If so, could you let me know (a) what value I'm looking for on the MM in ohms, and (b) whether to set the MM to the lowest ohm range or other?
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samstone
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Posted Wed Oct 9, 2013, 4:25pm
Subject: Re: Rancilio Silvia Won't Stop Heating
 

A local repair guy suggested (without looking) that it could be the OPV stuck. Does that make any sense?
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frcn
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Posted Wed Oct 9, 2013, 5:13pm
Subject: Re: Rancilio Silvia Won't Stop Heating
 

Not the OPV. it is possible that you have a bad new thermostat. On my website, in the right-hand column, there is a color wiring diagram for Silvia. Use that to test it. There is also an article called " How a Rancilio Silvia Works" with separated diagrams showing the wiring for each mode. between those and an volt/ohm meter it would be easy to figure out the problem, if you can read a schematic and use a volt meter safely.

 
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