Hi folks. Had problems a couple of weeks ago with the diverter valve. Got a service kit and has been ok since. New problem now.... When switching on the CH the boiler lights up for 5 secs and then switches off then immediatly starts up again for another 5 secs. This happens 4 or 5 times then it stays on and works fine!. Not sure if it's affecting the DHW but yesterday ran a bath with no problems for the baby then tried to top it up for our bigger baby and the water went cold, but after turning water on and off a few times, hot water came through! Any idea's?.