Mini Vivaldi steam boiler autofill issues

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applepod124
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Mini Vivaldi steam boiler autofill issues

Post by applepod124 » Thu Aug 29, 2019 5:54 pm

I have a Mini Vivaldi which has intermittent problems with autofilling the steam boiler. After using hot water or steam, the machine does not consistently refill the boiler. Instead, it simply heats up without filling. Sometimes it does refill properly. If the machine is off for several hours, it may refill once it is turned on, which takes several seconds. As this is a very inconsistent issue, I'm not sure how to diagnose it. I took it to a local repair service, who cleaned the autofill probe, but the issue persists. I spoke to Chris coffee, and they suggested it could be the autofill probe. I disconnected the autofill sensor cable and turned on the machine, which did not cause the pump to run in order to fill the boiler. I understand that it could be the autofill probe itself, the cable connecting it to the main CPU, or the CPU itself. I was told that the next step would be replacing the CPU since disconnecting the autofill sensor doesn't allow it to fill, but as this is an expensive part to replace, I'd like to explore other possibilities, and I'm looking for guidance on how I should proceed.

Thanks!

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chas
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Re: Mini Vivaldi steam boiler autofill issues

Post by chas » Sat Aug 31, 2019 8:56 am

You may want to check out this thread: viewtopic.php?f=57&t=2416.This guy was having the opposite problem (overfill). However, the basic troubleshooting steps are the same.
Chas
LM GS/3 & LaSpaziale Dream v 1.23 (US 120V)
Mazzer Kony E, Customized Rocky
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chas
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Re: Mini Vivaldi steam boiler autofill issues

Post by chas » Tue Sep 03, 2019 8:42 am

Unfortunately, if you have unplugged the water level sensor from the circuit board and the problem persists, the issue probably is on the controller board. Something on the board seems to be at least partially shorted to ground. There are actually 2 or more parts in-line with the sensor before the signal gets to the computer chip. You may want to pull the board out to see if something has gotten on the board that can be cleaned off. Otherwise, you my be in need of a new board.

The fact that it works when you first turn it out but not later may indicate that the issue is either with a bad capacitor or a heat sensitive component.

BTW: Needing to clean or replace the sensor is usually only an issue when the boiler fills until it overflows and won't stop. The water level "sensor" is really just a metal rod so there isn''t much to go "bad".
Chas
LM GS/3 & LaSpaziale Dream v 1.23 (US 120V)
Mazzer Kony E, Customized Rocky
Hottop P/B

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