When I turn the heating on the pressure gauge goes up in the red mark area. And the boiler water goes out by the pressure relief valve and the prssure gauge come back to normal green area, then after one day boiler stops and light comes on boiler (system) pressure low.Why does this happen? If anyone knows any solution to the problem, please let me know.

Baljinder Chahal, October 2005

it sounds like the expansion vessel on the boiler needs recharging or is faulty check this first

d.., October 2005