potterton suprima hissing and lockdown

[askpin]

afternoon


im getting water hissing noises from my potteron suprima 40l. sometimes the boiler goes into lockdown (red flashing light)

so i was wondering if this was likely to be a water pressure issue?

ive already had the water pump replaced and a new myson power extra was fitted about a year ago, at that time the boiler was banging, the pump has helped but the hissing is coming back and heating starting to fail again

 

[Dotty]

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