Upload a picture of the gubbins in your airing cupboard or where the pump is.
A bypass links the flow and return pipe. Should be set to be open only when all the rads are off and/or the motorised valves have shut.
Ok here the pics. So tonight i switched on. Went on for about 5 mins and pipes on either side of pump went mega hot. After a few mins, the pipes cooled right down, image on boiler still had burner flame but was not heating, then went into S7.
So, i then turned the valves on either side of the pump to one side, at first i tightened both and boiler came up with blocked error S98.
After i realised i turned right off, i rotated the other way to turn on fully. I now only get error S53 with the ignition flame on but no heating whatsoever. Will try again tomorrow to see if S7 comes back






