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Potterton suprima boiler, tank in airing cupboard, 3 port valve with a potterton myson 322 actuator. Ok to get the heating on you need to run the hot water tap. else it wont start, on the bottom of the actuator is a switch auto or mid... when switched on mid sometimes the heating comes on...

I have a potterton suprema 100 boiler with an immersion tank and two divertor valves, the boiler doesnt fire up anymore when using hot water or if I put on the heating, If I switch the leaver on one of the divertor valves to manual the boiler fires up but then after about 10 seconds turns off...

Draining off sealed system central heating...Any tips on doing this? Its a potterton boiler with a maxflow cl 170 tank with an expansion vessel (red blob) that sits on top. Ive been having problems with this and have admitted defeat now and need help, basically i need to drain down system...