Grab a cup that you can get a measurement with, what you want to check is the flow of the group head when the machine is in full brew(actuator to the left) mode. You are looking for about 4 ounces in 10 seconds through the group head.
If you have noticeably less than 4 ounces of water in 10 seconds then you'll want to check your inlet water flow described in "Inlet Water Flow" below.
If you get 4 ounces in 10 seconds you'll want to check your pump power setting in "Pump Setting" and then your drain tray in "Expansion Valve & 3-Way Valve"
Checking the pump setting and testing the pump setting requires a portafilter with the backflush blank inserted. With the machine on:
If a pump needs to be set at 35% or higher to achieve 9 bar pressure you'll want to check "Expansion Valve & 3-Way Valve" section.
If the pump reaches 9 bar pressure while backflushing but not while pulling a shot, verify that you are pulling a shot in 25-50 seconds and that the coffee bed is creating enough back pressure. If the coffee bed is creating correct back pressure check "Inlet Water Flow".
To check the expansion valve you will need a backflush blank and Phillips screw driver. The first thing you want to do is put a portafilter with a backflush blank into the group head and backflush the machine for 30 seconds. During that time watch the black relief valve in the drip tray to see if it leaks water. It will leak water once you release the backflush so it is important to run a long backflush to check for leaks. If it does leak while in the process of backflushing you will want to:
If either part is leaking contact us at email@example.com with information regarding the issue and machine serial number.
This is to test and verify that the water line suppling water to the machine has enough flow. With machine off:
If you are receiving closer to 1 or 0.5 GPM then the issue is the Slayer is likely not receiving enough flow and you may need to replace your inline filter and softener.
If none of the above troubleshooting showed the cause of the low brew pressure the issue is most likely due to a failing pump. Please contact us with the results from above troubleshooting to receive a new pump and follow our pump replacement instructions.