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Ok, had a look at the flow switches and removed the actuator for the ch/how water valve. But to remove the valve body looks like it needs a special spanner ? Sort of a splined device about 18mm in diameter ?? Am I missing the pint here ? Being as both the CH and the HW functions are...

I could do with a diagram for the boiler, so that i know where each of the valves are for removal and cleaning etc. Can anyone point me in the right direction for such a diagram please ? :-)

Ok all you boiler experts ! My Bahama is playing up. Symptoms are : Heating comes on, goes off, comes on, goes off etc about every 10-15 secs. The rads get warm but not hot. Hot water similar, basically when i turn on a tap the boiler fires up but only for a few seconds then cuts out...