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Most of these noise issues can be solve by setting the correct pump map. The normal setting is proportional pressure high which is to high in a lot of cases. In the first level service function 1c set the pump to 0 so you can manually adjust the pump step in 1d. this goes from 2 - 7 set a low...

My boiler was fine until it was serviced, it had been in 3 years from new without a service and working fine. It appears if you disturb the electrode or cable, the slightest of damage (they a fragile do to the heat) means its possible the boiler will the play up. EG go onto lock out The...