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Yes , when boiler was drained to replace pump head , pressure gauge dropped to zero and on refilling needle goes up. Have also tried changing pump speed, can feel pump is working as vibrates less on low speed and more on high speed. Normal selection is high speed , fault still occurs Not sure...

Good question but flow and return valves are definitely on, happens in heating mode too. Thanks for your replies so far

Yes, pump is running, can feel it vibrating and getting hot, flow and return pipes under boiler heating up too. Have vented by undoing pump screw and it lets out a spurt of air and water, done that several times until only water dribbles out, air vent is built onto pump housing body too and that...

Thanks for your replies (1) it’s not the flame light flashing or on lockout. it’s the ignition light (eggtimer) flashing. Yes the boiler lights up (flame detected) as shown by flame light staying on and runs fine for a few mins. (2)hot water mode has same issue as heating mode runs hot water...

Hello , would be great if anyone can help Boiler fires up in CH mode, pressure is 1.2bar cold, runs for a few mins, then ignition light flashes indicating lack of water or water circulation problem although pressure is fine on gauge. Pump head has been changed and pump seems to be fine. Boiler...