HELP .....hello everybody, i have a WB GREENSTAR 24i JUNIOR, the CH is working but the DHW comes on and fires for about 30 seconds and then goes cold. i have looked at the diverter valve and that operates as it should i.e. when CH is demanded the valve goes down and when i turn on the hot tap it rises. i looked at a pdf installation and commissioning manual which has a flowchart, it looks to me that the boiler is in a failsafe mode in that the water temperature maybe too high which results in the boiler shutting down for safety. although i don't have a thermometer my hand tells me that the water is somewhat higher than the preset 55 degrees. i know the temperature is factory set so what can i do? i think i have included all the information in this post so can anyone please help? Rog