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how I can fix my boiler glow worm flow model 30 si?

My boiler flashes F5 on the panel, no heat and no hot water, I looked for the red switch I could not find it, I wonder what is the problem, please help me out to sort out this problem.Thanks
Ben, June 2009
using normal 'copy and paste Tool ' add this question to Catagory 'Heating' subheading ' home heating systems' and leave it here so you have two reply outlets.

Charlie, June 2009