Question about Nuova Simonelli Mac 2000 I Group Espresso & Coffee Maker

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Boiler does not refill properly

The sight glass shows no fluid level. What causes this and how do I fix it?

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Chances are, your level probe (rhs of the boiler) is dirty/scaled.Then the probe is always earthed and does not allow water in as it thinks it's always full.
Take it out and clean with wire wool(obv with no pressure in the boiler).It should have a red wire attached to it.
When you refit it, make sure the part inside the boiler faces down.

Posted on May 08, 2009

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Posted on Jan 02, 2017

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