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glow worn boiler says f9 on display and will not work?

glow worm combi boiler cxi not working says f9 on display tried the reset option doesnt work .
jac, March 2010
water pressure may be too low, try topping up. water pressure switch may be blocked, also on some early models the overheat stat, which has a manual re-set causes the same fault.

Ian, March 2010
F9 - Pressure -

water pressure connector loose/ unconnected/ faulty or wires trapped.
water pressure sensor faulty.
pump ceased/ faulty

http://www.glow-worm.co.uk/products/pdf/current/Ultracom_cxi_installation_manual.pdf

- page 46

hope this helps

Gaz, March 2010
link Click here to see other fixes for Glow-worm CXI.