Why does my boiler keep switching on and off?

thanks very much - will run those checks

jimmo
May 2014

With the hot water tank cool/cold select hot water only and then monitor the flow and return pipes at the boiler,the flow pipe should gradually warm up and return should be cool,if the flow pipe gets quite hot quickly the water flow is too slow,
you say it was power flushed so the pump could be a factor.If the flow and return seem to heat up more or less together it could be the bypass valve that needs adjusting

toptrish
May 2014