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Hi, After the last post i've moved my pump to a higher location and the vent pipe is now the at the absolute top of the system, so the air issue is sorted. But this has now shown a clear problem in the boiler. Its a halsted blenheim 15/30, this is what it does: heats one cycle, reaches the...

My boiler keeps overheating and shuting off. I\\\'ve replaced the thermostat, but no joy. It works with the setting very low.. though this is very little heat. I think i might have air in the system as the pump does\\\'nt bleed any water just hisses when the screw is removed (whilst the pump is...