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  • Pressure gauge at max.

    Hi folks. Have an old grimac Mia. This morning I heard it hissing during heat up and noticed the gauge was at max. There is no visible sign of a leak. Before I start messing around thought I'd ask the brains trust. Faulty thermostat? Assume if there was an actual leak somewhere that may actually reduce the pressure? Any advice appreciated, cheers. Steve

  • #2
    Dead pressurestat

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    • Burkeyboy
      Burkeyboy commented
      Editing a comment
      Cheers, makes sense. Any chance they're a fairly standard bit of equipment?

    • Caffeinator
      Caffeinator commented
      Editing a comment
      Yes- Google Expobar Pressurestat.

  • #3
    If it is this one, I found the prices vary wildly on the web.
    Last time I needed to replace, I ordered one from UK (still best price even with postage) and took the original out and gave it a clean in some backwash detergent for a bit.
    Put the original back in place after a clean and it was working OK, so I figured I have a temporary fix whilst waiting for the new part to arrive.

    The temp fix lasted for about 11 months!
    On the plus side, this time when it died, I had the spare ready to go!

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    • #4
      Looks correct. All do the same thing, just the old analogue spring version and the newer micro switch version.

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      • #5
        [QUOTE=fatboy_1999;n836715]If it is this one, I found the prices vary wildly on the web. Last time I needed to replace, I ordered one from UK (still best price even with postage) and took the original out and gave it a clean in some backwash detergent for a bit. Put the original back in place after a clean and it was working OK, so I figured I have a temporary fix whilst waiting for the new part to arrive. I might give this a try while I’m waiting for this same pressure stat to arrive from the UK. Can I ask how did you do this? Did you remove the pressure stat and just give it a scrub with a toothbrush or something? I would have assumed you shouldn’t completely submerge something like this but I wouldn’t know.

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        • #6
          From memory, I took it out and stood it up in a small container so that the circled area was covered.
          Then let it dry thoroughly before putting it back in place.
          I did play around with the dial a bit as well to try and free up anything that might have been causing the issue, so if you do that, I recommend putting some kind of mark on the dial as a reference point.

          When I put mine back in, I thought the clean had failed since the pressure went past my expected setting of 1.1, but it did stop at 1.3. It was my fiddling with the dial that set the level higher.
          It's simple enough to adjust in place (when you have access) but I was never comfortable enough to do it without making sure the machine was off and unplugged just in case.
          I'm sure other people are confident enough to do it while the machine is on, but not me.
          Click image for larger version

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          • #7
            Had a similar problem with my BFC Diadema Junior Plus. Turned out to be a leaky thermosyphon valve Ordered a new one from CoffeeParts and fixed the hiss. The pump does not come on nearly as aften now.

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