baxi duotec 28he is showing error code e119. Pressure is just above 1 bar. central heating and hot water will not come on. Don't have installation manual but front panel states that code e119 is low system pressure below 0.5 bar. Any help much appreciated.
Plate exchanger was the problem. Full of sludge and debris. Looks like when the boiler was installed the installer hadn't flushed the system aithough he said he had.
Replaced with plate exchanger with a new one and added sludge remover and cleanser to the system. Going back next week to drain...
When running the hot tap the boiler makes a loud banging noise and the presseure dial goes upto 3 bar. Burner lights up till temperature shows 99 then it goes out and reignites again. Flow pipe gets hot when hot tap is running?
I thought it was the diverer valve diaphragm split thus sending hot...