if pressure is ok then no.
common fault on these.
keep me in a job thanks to mrcentralheating and his sabre heatpack deals fitted by fuds fitting se boilers.(i know you can get he compacts)
usually go **** up 2 years how old is yours?
I am experiencing the same exact problem, what did the guy you got in say and how was it fixed? Any help would be great.
Got it fixed, was the Primary Thermistor
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