Expobar Brewtus III - pressure drop during extraction

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daniel0572
Posts: 1
Joined: 8 years ago

#1: Post by daniel0572 »

Setup: Expobar Brewtus III, age 7 years.
My brew pressure is dropping off during the extraction. It sounds like the pump is turning off, only to turn back on after a while. Flow rate is OK, and subjective espresso taste is getting worse.

See the video:
Brew pressure slowly rises to about 9 bar, and it drops down to 5-6 bar before the pump turns back on, or at least gets louder.

[youtube]Qo2G7L7ZEaY[/youtube]
https://www.youtube.com/watch?v=Qo2G7L7ZEaY

Is this pump failure (as described there Inconsistent brew pressure), or more an OPV related issue?

User avatar
thecatch83
Posts: 290
Joined: 8 years ago

#2: Post by thecatch83 »

When was the last descale performed?

DeGaulle
Posts: 545
Joined: 10 years ago

#3: Post by DeGaulle »

Do you have the same behaviour if you run the pump with the blind disc in place?
Bert