Hot water problem BIASI RIVA ADVANCE HE M110B.32SM/C

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Please help!
I have the BIASI RIVA ADVANCE HE M110B.32SM/C

Hello, there is a boiler in the above model in the house where I am staying. The general problem is that hot water suddenly cools down when flowing. warms up again gets cold again. Can you support me with this problem?
 

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first thing to do is top the system pressure up to between 1 and 1.5 Bar
 
Plate heat exchanger likely to be blocked.
Run a hot water tap ,let it run continuously and observe the temperature dial on the boiler. If it rises rapidly to around 75/ 80 degrees its likely the plate hex.
 
first thing to do is top the system pressure up to between 1 and 1.5 Bar
As you said, I increased the bar pressure to the level you specified. but the problem is the same
 
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Plate heat exchanger likely to be blocked.
Run a hot water tap ,let it run continuously and observe the temperature dial on the boiler. If it rises rapidly to around 75/ 80 degrees its likely the plate hex.
When I turn on the hot water, it goes up to 80 degrees as you said. What should we do? Is there a solution?
 
Nothing in the gas regs to stop you doing it yourself, just depends on your own competency in doing it, not a hard job
 
Yes lots on youtube, just be carefull if you go down the cleaning route, the chemicals are very aggressive , make sure you take care and wear the correct gear, to be honest a new plate on Ebay is not expensive and comes with the seals , probably your best bet
 

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