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thanks - should have checked FAQ first I know. Think have overfilled system now by leaving the filling point open slightly. Got it closed properly now but pressure (cold) is stable at just below 2 bar. Have left turned off for now Also have discovered underlying problem of leak - drips...

I have no CH or hot water - low pressure warning light on the boiler flashing. On resetting, the boiler ignites for a few seconds then goes out. Pressure rises to about 0.5 bar on lighting - needs to be between 1 and 1.5 bar. How do I increse pressure in the system? thanks!