I've run out of ideas for getting our CH system working. Our regular plumbers have been here for nearly 2 days and we still have a non working system.
The boiler seems to be stuck in an overheat cycle. It heats, overheats and shuts down for 2 minutes and then repeats.
The pump, 3 way valve and air separator have all been replaced. The AAV in the boiler has been replaced and the system has had mains water run through it to wash it through. The water came out black and was run until it came out clear. It seemed to flow fine with no restriction.
Originally it was though that there was a blockage in the CH system and the plumbers still seem to think that a Powerflush is the way to go. My only comment is that the boiler still overheats if we isolate the CH and ask for HW only so if there is a blockage it must be on the single return pipe to the boiler but this pipe does get warm when HW only is on.
I think there may be an issue with the boiler. Heat exchanger maybe?
Can anyone give me any ideas where to investigate next?
The boiler seems to be stuck in an overheat cycle. It heats, overheats and shuts down for 2 minutes and then repeats.
The pump, 3 way valve and air separator have all been replaced. The AAV in the boiler has been replaced and the system has had mains water run through it to wash it through. The water came out black and was run until it came out clear. It seemed to flow fine with no restriction.
Originally it was though that there was a blockage in the CH system and the plumbers still seem to think that a Powerflush is the way to go. My only comment is that the boiler still overheats if we isolate the CH and ask for HW only so if there is a blockage it must be on the single return pipe to the boiler but this pipe does get warm when HW only is on.
I think there may be an issue with the boiler. Heat exchanger maybe?
Can anyone give me any ideas where to investigate next?