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heat & boiler fill stop after machine heats up
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methyltheobromine
Senior Member


Joined: 3 Jun 2008
Posts: 14
Location: Philadelphia, PA
Posted Sun Sep 29, 2013, 7:58pm
Subject: heat & boiler fill stop after machine heats up
 

My daily machine, a Euro 2000 Jr (very similar to an Isomac Tea) recently
developed a problem. About the time the machine reaches normal idle
temperature (~35 minutes), the autofill and heater stop. I've got
Eric's thermometer installed, and the problem seems to happen when
the thermometer reaches about 205, about 10 degrees below the normal
long-time-idle temp.

As the machine is getting to operating temp, it works properly--I can
dispense water through the hot water wand and the boiler will refill,
and the pressurestat cycles on & off normally and activates the heater.

Once the heater & boiler refill stop, they do not respond to normal
triggers (lowering the boiler pressure by releasing steam, releasing water
through the hot-water wand). The HX continues to work (the pump operates).

After the machine has cooled to about room temperature, it will restart
just fine, with the autofill and heater operating normally.

I've tried disabling (bypassing) the pressurestat and overtemp sensor,
and this makes no difference.

Running the machine with the case open delays the onset of the problem,
but does not eliminate the issue.

I'm wondering if there's some heat-related problem with the SSR or Giemme
controller, and open short that only happens when the components are
hot. Does that sound likely? Any other suggestions for a solution? Any tips for
troubleshooting the SSR and Giemme?
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SStones
Senior Member
SStones
Joined: 24 Nov 2012
Posts: 477
Location: Canada
Expertise: Professional

Espresso: Giga 5, ECM Giotto, Rocket...
Grinder: Anfim Milano-Best
Vac Pot: No  :(
Drip: Some $30 thing from Walmart
Roaster: I buy pre-roasted.
Posted Mon Sep 30, 2013, 4:48am
Subject: Re: heat & boiler fill stop after machine heats up
 

My guess is that the transformer (On the Giemme controller) is overheating and failing to produce the control voltage for the sensors and relays.  It is probably overheating from it's own internal heat generation, the fact that it corresponds with the heating time of the machine is coincidental, and simply movind the controller outside of the machine won't solve the issue.
Before replacing the most expensive parts(Like the controller) be sure to rule out the cheap parts. Check that there's no voltage drop across the SSR Load  while the problem is occuring.
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