please help, my "british gas f2" potterton boiler keeps cycleing every 30 secs or so.
central heating~ from cold the boiler will stay on fine untill the return pipe to boiler is up to temp (all rads warm) then will cut out as it should. now the problem starts as the boiler will turn on for 30secs then off for 30 secs and so on until the room stat turns the system off.
hot water~ same again boiler works fine untill the return water pipe is up to temp then the boiler cuts in and out every 30secs.
the 3 way valve seems to work fine and so does the pump, i have had 2 plumpers/boiler repaiers round and they say that it is not right but cant say why. the boiler has just been serviced as well.
any ideas? cheers paul