My Brew Pressure is Too High / Too Low on My Expobar Brewtus IV

Brew Pressure Issues on the Expobar Brewtus IV

If you are experiencing issues related to brew pressure on your Expobar Brewtus IV, it's likely an easy fix. Refer to the instructions below for step-by-step guides and videos on how to diagnose and resolve your brew pressure problems.

Brew Pressure is Low

Do you have the backflush disk in?

This is the only true test of brew pressure. Coffee has too many variables. The backflush disk gives us a control model. With the backflush disk in, the gauge should rise to 9 bars in 9 to 11 seconds. If it does not, your brew pressure is truly low. Try running a test of the vibration pump, and adjusting the OPV.

If the pump pressure is low, you may want to consider replacing the pump, OPV and deairator as a catch all.

Does the gauge ever return to zero? If your machine runs off a water reservoir and the gauge never returns to zero, the gauge is unreliable. Sometimes on a plumbable machine, the brew pressure gauge can rest above zero, due to the water line pressure. If the gauge is unreliable, it can be replaced using the instructions in the document attached at the bottom of this article.

 

Brew Pressure is High

Do you have the backflush disk in?

Do you have the backflush disk in? This is the only true test of brew pressure. Coffee has too many variables. The backflush disk gives us a control model. With a rotary pump, and the backflush disk in, the gauge should rise to 9 bars in 4-6 seconds.

  • What is the brew pressure with the backflush disk in? Is it over 9 bars?
  • What the pressure from your water line to your machine? It should be about 35 PSI or lower. If your water pressure is really high in your house, (approximately 60 PSI or higher) this is going to place a lot of extra pressure on the pump, and will affect the pressure at the group head.

Try adjusting your OPV. The OPV may be too open and needs to be adjusted down. The OPV and the Pump need to be adjusted together. Example, If the pump pressure is 8 ½ and POV is open at 9 bar. The OPV will need to be adjusted to open at 11 bar, which will cause the Rotary pump pressure to raise more to 9 bar. Adjust OPV to 11 bar, then adjust pump pressure to 8 ½ bar. If these adjustments are not made together it will cause flow issues while brewing. Specific can be found in the attached document below.

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