Thanx for that-i removed the inspection cover exposing the burners and tried to lite it up.The burners ignited but on a very low flame.When i replaced the cover, effectively sealing the "combustion chamber",the unit died and as was before (it would not lite up)
As for overheating,the unit...
Has anyone got any ideas why i cannot start my combi? I turned off the power to it before going on holiday and cannot get it to work again.The green power lite is on,pump starts,extractor fan on,ignition clicks away merrily...then it cuts out and the red lite comes on.It was working perfectly...