Hi there,
My 10+ year old Giotto premium plus is having a brew / boiler issue preventing me from making coffee.
The machine switches on, fills and stops filling, heats up gets to the 1.2 bar boiler pressure (as indicated) and will happily cycle over time.
Running against a blind filter the boiler pressure starts to fall steadily and will drop below 0.5 bar before suddenly skyrocketing and the boiler over pressure tripping.
The machine is running on filtered water via a fridge and is a vibe pump unit. Same water source now for many years.
What I have done:
I'm finding that the boiler seems to be overfull after this issue occurs, and it seems that running the brew cycle is causing the boiler to over fill with water.
Is the boiler fill solenoid or perhaps the one way return valve the next culprit to assess? Possibly the controller?
Any other tips?
Thanks,
Andrew.
My 10+ year old Giotto premium plus is having a brew / boiler issue preventing me from making coffee.
The machine switches on, fills and stops filling, heats up gets to the 1.2 bar boiler pressure (as indicated) and will happily cycle over time.
Running against a blind filter the boiler pressure starts to fall steadily and will drop below 0.5 bar before suddenly skyrocketing and the boiler over pressure tripping.
The machine is running on filtered water via a fridge and is a vibe pump unit. Same water source now for many years.
What I have done:
- Cleaned the water level sensor, checked continuity of sensor wiring down to the controller
- Replaced the boiler vacuum valve which had a slight leak with a new unit
- Replaced the expansion valve which had a slight leak (the rubber mushroom was worn).
- Tried to adjust the expansion valve to get brew pressure - however boiler OPV is going off preventing me getting up to brew pressure
I'm finding that the boiler seems to be overfull after this issue occurs, and it seems that running the brew cycle is causing the boiler to over fill with water.
Is the boiler fill solenoid or perhaps the one way return valve the next culprit to assess? Possibly the controller?
Any other tips?
Thanks,
Andrew.

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