Glow Worm 30CXI dirty system

Hi

I have a Glow worm 30 CXI boiler, it currently shows F9 error message. I tired re-pressurizing the system, but it did not solve the issue. Any other idea how to solve F9 error?

Thanks

Ben

Hi Ben

Did you try flushing your boiler? Glow worm boilers are very sensitive to the dirt and the sludge. Glow warm recommends particular chemicals to flush the system, and those really should be used if you want to have a smoothly working boiler. Flushing boiler takes a good few hours as you should stop only once the outcome liquid is transparent