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Problem with brewing pressure - ECM Technika IV Profi

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  • Problem with brewing pressure - ECM Technika IV Profi

    Not sure if this is in the right category so mods please feel free to amend.

    I have a 2 year old ECM Technika IV Profi and the brewing pressure has dropped down to 6. I have tried to manually adjust it but no success. It is also intermittently cutting off.

    And ideas?

    Thanks.

    Click image for larger version

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  • #2
    G'day mate...

    Probably would have been better placed in the "Pointy End" machines category....

    What happens if you grind fine enough to choke the machine; pressure still low?

    Mal.

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    • #3
      Haven't tried that but I did a backflush but pressure still wouldn't go past 6.

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      • #4
        When you say manually adjust you mean you've increased resistance on the over pressure relief valve, yes?

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        • #5
          Originally posted by sprezzatura View Post
          When you say manually adjust you mean you've increased resistance on the over pressure relief valve, yes?
          I'm not too familiar with all the correct terms but see the screw right under the water tank, I've turned that clockwise all the way.

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          • #6
            That's correct. Did the pressure come up at all?

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            • #7
              Also, try placing your blind (cleaning) basket in the group handle and engage the pump: does water discharge through the clear silicone tube connected to the brass valve below the screw we're talking about? It returns water to the reservoir (tank).

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              • #8
                Originally posted by sprezzatura View Post
                That's correct. Did the pressure come up at all?
                No, stayed the same at 6.

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                • #9
                  Originally posted by sprezzatura View Post
                  Also, try placing your blind (cleaning) basket in the group handle and engage the pump: does water discharge through the clear silicone tube connected to the brass valve below the screw we're talking about? It returns water to the reservoir (tank).
                  Checked that as well, and it seems to be functioning properly. Still brewing at 6 bars and there doesn't seem to be any loss of water.

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                  • #10
                    My guess, if the screw on the bypass valve is in all the way clockwise (least water bypass) and your pump is operating nominally then you may have a faulty OPV (over pressure relief valve - which regulates reciprocating pump pressure). Other culprits can be: faulty pressure gauge; obstruction downstream from OPV which may be in the group head itself.

                    Unless you're keen to start disassembling your group to trouble-shoot further it may be a good time to take it in for a service.

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                    • #11
                      There is the intermittent power issue you mentioned as well. This can be any one of (probably) 3 things electrical which requires electrical fault diagnosis. Unless you're electrical it's better to have a machine tech trouble-shoot it for you.

                      I used my last machine @ 4.5 and 6bar. It was pretty happy there. Grind fine and tamp light until you can find a good service centre (there are plenty here - see Sponsors).

                      Matthew

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                      • #12
                        Gosh! I missed something! The Profi has a rotary pump in the rear. You may need to adjust the bypass on the rotary pump.

                        Here is an image. The adjustment is on the right in the image (not mine) which is on the pump. The other (on the left) is the OPV on this model.

                        You will need to remove the cowling to get to the rotary pump. You will know if you have a rotary pump because the machine won't sound like a miniature jack-hammer when you're extracting a shot.

                        Same rule applies: clockwise to increase pressure.Click image for larger version

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                        • #13
                          If adjusting the bypass (which normally has a lock nut) does nothing to the crew pressure (check with a blind) then it's possible the piston inside the bypass is stuck and not moving. This happened on my machine (Faema) and I unscrewed the bypass from the pump head, cleaned it up, relubed and all was well.

                          If you adjust your brew pressure to 10 bar with a blind it will be about 9 bar with a brew flow.

                          You want to adjust the OPV to 12 bar. It's there so if the pump pressure goes very high the OPV will bleed off the excess as a safety fail safe. You can test it by ramping up the pressure on the pump and seeing when it starts bypassing.

                          Cheers

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                          • #14
                            Definitely - the bypass piston is a culprit. You can back it off a full turn and advance it the same several times which can free the piston (sometime the o ring on the piston can stick after a period of non-use).

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                            • #15
                              Yep that's what was wrong with mine. No amount of turning the screw would free it. On my pump head the entire piston housing could easily be unscrewed and everything cleaned and lubed. It is just a piston with a seal and a spring behind it to provide the adjustable pre load. I posted a thread on it here a while ago it's pics.

                              Should be an easy fix.

                              Cheers

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