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Peculiar behaviour by Isomac Venus, tech issue? - Page 2

Postby JimG on Sat Nov 06, 2010 1:34 pm

foolishrice wrote:I could not see any thermal grease on either of the thermostats, not even traces there of. I'll definitely be getting some of that.

Can't hurt, and I would do this, too. But thermostats with a screw-in stud should have decent thermal transfer properties either way.

foolishrice wrote:What about getting a thermostat rated for a temperature slightly below 100°C?

Before this problem showed up, were you getting satisfactory performance from the machine? As an academic exercise it would be cool to know how different thermostats affected the taste of the espresso. But if it once worked well with a 100C thermostat, then it should work well again.

Jim
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Postby erics on Sat Nov 06, 2010 1:52 pm

The thermal grease is a "nice to have" with that particular thermostat as compared to "mandatory" with the thermostats that are held in location by a metal bracket. I would replace it with a like part - did it not perform satisfactorily for some years?

These are inexpensive parts here in the US - ~$15 but maybe you can test the existing thermostat with an ohmmeter?
Skål,

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www.ptscoffee.com: without the love, it's just coffee
www.ptscoffee.com: without the love, it's just coffee

Postby foolishrice on Sat Nov 06, 2010 4:10 pm

Yes, until recently she's been performing very well. I can still pull great shots by treating her right; surfing the temperature really.

erics wrote: ... maybe you can test the existing thermostat with an ohmmeter?

What would I gain by testing its resistance? I know for a fact that the thermostat still switches on and off; it just seems to do this at a slightly elevated temperature...

I'll try to get hold of a new thermostat from a retailer/workshop next week. Hopefully they won't rip me off.

Botten upp,
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