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Brew Gauge

Brew Pressure Gauge Needle Value Changes Oen:

• This is normal. The lowest number (usually 3-5 bar) reects the incoming line pressure. When brewing

the needle reects brew pressure (8.5-9 bar). When the brew tanks heat, the water expands and the ex-

pansion valve relieves the pressure at 11 or 12 Bar.

Brew Gauge Needle Fluers or Vibrates:

• Water is in the gauge or tube. Remove the gauge and tube, blow out the water, and reinstall.

• Pump is failing; replace the pump.

• Gauge is failing; replace the gauge.

Brew Pressure is Low:

• SINGLE PUMP MACHINES ONLY: When brewing on one group and another group is acvated, some wa-

ter will be diverted to the second (or third) group. This will slightly reduce available brew pressure.

• Expansion valve may be set too loose. Check that the pressure in the brew system reaches 10-12 bar

while heang from a cold state. If the pressure does not exceed brew pressure, the expansion valve will

need to be ghtened.

• Check pump to make sure pressure is properly set.

• Water supply hose to the pump is kinked.

• Water lter is plugged. Check and replace if necessary.

• Brew valves are worn and water is being diverted to the discharge (drain). Check that the brew valves

are not discharging water while the group is on. Look for error VMUF0#.

Brew Pressure is High (above 12 bar) While Machine is Idle:

• The expansion valve needs to be adjusted. The valve adjustment should be turned counterclockwise to

decrease the maximum pressure to 11-12 bar. The valve should drip water as a sign that pressure is

bleeding.

• The gauge has lost calibraon. Depressurize the brew system and ensure the gauge needle returns to the

zero point.

No Brew Pressure; Pump/Motor Runs:

• Brew Solenoid is stuck (can be caused by soap residue not fully ushed aer cleaning).

• Brew Solenoid has failed.

• The line between the pump and the water supply has collapsed or is kinked.

• The line to the pump is kinked.

• Water lter is plugged. Check and replace if necessary.

• Water supply is inadequate.

TROUBLESHOOTING

Synesso MVP Series User Manual

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