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what does f12 with red light flashing mean on a glow worm 30cxi boiler mean?

what does f12 with red light flashing mean on a glow worm30cxi boiler i already have no hot water the heating is working but all of a sudden this light has started flashing with this error

wilbur
March 2010

Heating, Home Heating Systems Red Flashing Boiler

in the manual f12 is a problem with the wiring at the pcb's. but 9 times out of 10 it is the hw flow switch

ray
August 2010

Maybe you can find the issue in the service manual but i cant find f12. Here is a link for the manual Hope this helps.

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

Stewiesnake
March 2010

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what does f12 with red light flashing mean on a glow worm 30cxi boiler mean?

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what does f12 with red light flashing mean on a glow worm 30cxi boiler mean?

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what does f12 with red light flashing mean on a glow worm 30cxi boiler mean?

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Worcester boiler dripping water?

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