My greenstar 30si now has no blue light on at all, not even flashing. It does give me heating and hot water, however i have to run the tap really slow to get the water to run really hot, this wasnt the case before. Any ideas whats up with it?

Gio, April 2009

OK, to get your blue light back:

Press spanner button for 10secs til lit
press ECO once
press spanner once

Blue light should come back (this is user option for ppl that have them fitted in bedrooms etc where the light would disturb them).

As for DHW, make sure the dial is turned right up (in case someone has messed with it). Hard to say how slow the flow is compared to how hot it is - to be really sure it's not performing to spec, measure how fast the flow is in litres per minute (fill a cola bottle or something with known volume) and measure the temperature of the hot water. Should get around 10l/min at around 40 - 45°.

Bunslinger, April 2009