pressure build up?

[AnonymousImport]

my heating system used to make alot of noise, afther running the hot water. but now afther being unused for the summer the convector doesnt heat my place no more, still gives hot water, with no noise now. there alot of green black stuff falling out (like some corrosive waste). when it starts heating i hear a bubbling noise, the pressure gage goes up high and it switches off. it doesn't com on no more unless i switch it off for a while... damn, its cold here

 

[Hamiltonandy]

Bet you never put inhibitor in your system. You have probably got a buildup of corrosion products, boiler overheating due to scale buildup and excess 'air' in system due to hydrogen generation.
Need system cleaner and then correct inhibitor to protect.

 

[AnonymousImport]

i think it must be that... thanks alot, friend..