It,s got green dials against a black background, the encasement is white. Do you suggest changing the diaphram thingy first then? Is that easy enough to do myself?
The problem is this; If the heating is not on, i don't get hot water. It seems the system works fine for the heating but if i want hot water I have to get it while the systems heating water for the radiators, when i attempt to get water any other time the boiler seems like it doesn't know hot...