La Marzoca 2 group dispense pressure only around 2 or 3

Question edited for its proper name.
Question moved from Washing Machines.

Did you measure it?

Ideal brewing temperature is between 195°F and 205°F
Is There a Perfect Coffee Brewing Temperature? According to the National Coffee Association, the ideal water temperature for extraction is between 195°F and 205°F, which is a little below the boiling point of water - 212°F. What's handy about this temperature range is that it works across all brewing methods.

Page 50 of the manual

The adjustment of the economizer for regulating the delivered water temperature is made by the installing service technician.

Thermodrive

La Cimbali https://www.cimbali.com > innovation > coffee > ther...

This system mixes cold water with the water from the group, so regulating the ideal temperature for every drink. If the coffee blend being used requires low ...

M34 SELECTRON

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The dispensing of hot water is controlled by the economizer which permits mixing hot water from the boiler with fresh cold water from the mains and controls its ...

Delivery Of The Coffee; Hot Water Dispensing - Cimbali M34 ...

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Cimbali M34 SELECTRON Manual Online: delivery of the coffee, Hot Water Dispensing. ... cold water from the mains and controls its temperature.

Adjust the expansion valve after making sure the pump brew pressure is at 9bar.

To increase dispense pressure you turn the adjustment screw at the pump. When pulling a shot (use espresso) on one group the bottom needle of the gauge should read 9bars while pulling the shot.

The only thing the expansion valve does is open when the pressure gets to 12 bars when the coffee boiler is heating or when you are backwashing the groups. If you need to adjust wait until red light comes on to say coffee boiler is heating then if gauge is going beyond 12 bars turn end of expansion valve to left to keep it at 12 or right to take it to 12 if it is lower, before doing this make sure pump is set to 9 bars.

If it is leaking from the gauge then have it replaced ASAP. It is easy to replace, just make sure machine is turned off and cooled and water is turned off.

The connection from the boiler to the pump is clogged, you can descale or remove connecting hose and clear.

Remove the shower screen and press button to brew, if water flows the the holes in the screw/diffuser is blocked, if water does not flow then the blockage is at the solenoid or within the group head chamber. This problem I have notice when someone brewed without the shower and screw in place.

You can dowload one from LaMarzoccousa.com.

With a flat head screw head driver adjust the pump pressure. The screw is on the left side of the image below.