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Re: I need a new pressure guage for an Astoria A2 -...
Here is the site where you can get your presure gauge and other parts for your machine.http://www.espressoparts.com/results.cgis?catalog=&select=NAME&keywords=astoria+pressure+gauge&image.x=15&image.y=14
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It is possible that the water coming into the pump from the mains is obstructed. If you have a water filter, that might need to be replaced. Some of the pumps have a stone filter on them, you will see a huge nut on the inlet side of the pump, that might need to be cleaned. Also check all water lines make sure you have no kinks. Pay attention to the gauge on the machine when the noise is happening if the water dispensing pressure lever should be at about between 3-6 bar when not being used and about 9 when brewing espresso.
The pressure releive valve is pre-factory set to open if the pressure in boiler reach between 1.6 to 1.8 bars.
So either you have the presure switch (presostat) not working normal which supose to switch off the electrical element at 1.2 to 1.3 bars.
So look at the presure gauge at which presure the presure releive valve open and releive the steam out from boiler if it shown more than 1.5 bar the you need to check the presure switch since it does not switch off the heating element.
If the presure releive valve open below 1.5 bar then you need to replace the releive valve.
Check to make sure that there is water in the boiler by either checking the sight glass then rocking the machine to see if the water level bobs up and down, then check the thermal reset switch on the left side of the machine above the element. Make sure there is water in the boiler before pressing reset and turning machine to number 2. After machine heats up make sure pressure does not go past 1.5 bars on the gauge. If it does then the p.stat needs to be replaced.
When you press the dispense button does the needle on the dispensing pressure gauge move up to the green area? If so, most likely your group head solenoid valve is bad. It's located behind the back splash. It's a small black box connected to a metal tube just behind the group head. They cost around $70.
If the needle doesn't move it could either be your pump or motor. Now you're in the $200 range.