So boiler had this issue in November, had leak was fixed and now has new leak and is doing it again.
Its potterton promax he plus 15/2, and the leak is now from the flow switch. Topped up the water, and then when boiler switched on for top up warmth, it made loud bang/vibration when igniting. This has now stopped, and system working as normal, but once boiler has started up and got to tempreture, then switched off, the next time it fires up, it seems to fire up fine, then switch off multiply times (on for 7 seconds, then off, on for 7 seconds then off maybe 4 times) then suddenly it either stays alight or switches off.
Any ideas?
Its potterton promax he plus 15/2, and the leak is now from the flow switch. Topped up the water, and then when boiler switched on for top up warmth, it made loud bang/vibration when igniting. This has now stopped, and system working as normal, but once boiler has started up and got to tempreture, then switched off, the next time it fires up, it seems to fire up fine, then switch off multiply times (on for 7 seconds, then off, on for 7 seconds then off maybe 4 times) then suddenly it either stays alight or switches off.
Any ideas?