I have a combi boiler. The hot water is still working but the heating is not. When I looked at the pressure gague it was reading 0 so I turned the black lever on the flexible pipe to increase my pressure to 1.5. unfortuantely the heating has not come on. As I was increasing the pressure the flame symbol light up for about 4 seconds but went off again. Is there anything else I can do?

Z, January 2009