generally the red is a moveable indicator to help show where the actual grey needle should rest when heating system is cold. 1 bar - 1.5 bar is spot on, i usually just set at 1 bar. If it stays there through time thats fine. it will rise with heat but should come back to rest at 1 when cold.
ste
October 2009
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
