The gauge on my Central Heating Boiler appears to have gone very high 3.5bar..... Do I have a problem, and how do I sort it..... Normally it used to sit around 1bar. Only just noticed it, and it goes up to around 4bar when it switches the heating on for the radiators, which is at the top of the scale.


Its a Gloworm Swift Flow Model.........(For those in the know.... )