Hi,
Was wondering if anybody could help, i have a Baxi solo 3 pfl boiler and a grundfos ups 18 60 pump. Also a honeywell 3 way valve. I noticed yesterday the rads were not on when i awoke so i looked at the timer and it said heating was on so i checked the boiler which was off with the overheat light on. I reset the boiler and 20-30 mins later it had overheated again. I have also noticed that the water pump seems to be pumping when i have neither HW or CH on, i know they do over run for a few mins but i dont think its that. Today i put on the hot water without the CH to see if the boiler would overheat and when it fired up it was banging really loudley and making all kinds of strange noises. I went up to the header tank to ensure there was water there and there was but it was warm! I have removed the cover from the motorised valve and got the mrs to first switch hw on and then off and then do the same with the ch and the 3 way switch seems to be doing what it should so im thinking from reading through all the great advice and help on this forum that maybe it could be the pcb which i do understand is quite a common problem with this boiler.
It isnt something i would do myself but it would be good to have some kind of knowledge of the problem when i get someone out.
Any help, advice would be greatly appreciated.
Many thanks
Was wondering if anybody could help, i have a Baxi solo 3 pfl boiler and a grundfos ups 18 60 pump. Also a honeywell 3 way valve. I noticed yesterday the rads were not on when i awoke so i looked at the timer and it said heating was on so i checked the boiler which was off with the overheat light on. I reset the boiler and 20-30 mins later it had overheated again. I have also noticed that the water pump seems to be pumping when i have neither HW or CH on, i know they do over run for a few mins but i dont think its that. Today i put on the hot water without the CH to see if the boiler would overheat and when it fired up it was banging really loudley and making all kinds of strange noises. I went up to the header tank to ensure there was water there and there was but it was warm! I have removed the cover from the motorised valve and got the mrs to first switch hw on and then off and then do the same with the ch and the 3 way switch seems to be doing what it should so im thinking from reading through all the great advice and help on this forum that maybe it could be the pcb which i do understand is quite a common problem with this boiler.
It isnt something i would do myself but it would be good to have some kind of knowledge of the problem when i get someone out.
Any help, advice would be greatly appreciated.
Many thanks