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British gas 330+ showing f22 ? Can anyone help?

Our British gas 330+ is showing f22 dry and will not fire up an anyone help
Wright, September 2016
F22 ''lack of water in system''
check F&E tank is full of CLEAN water
bleed ALL radiators to confirm presence/absence of water in system
if the water looks NASTY chances are you have a blockage ''somewhere'' in system

broken, September 2016