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f4 problem with a vitodens 100 boiler?

i have a vitodens 100 boiler and it has come up with a problem f4 I have hot water but the radiators are not working it sounds like it is firing up but cant understand how I have hot water but cold radiators

stanley o'keefe
January 2014
ViessmannViessmann 100Heating, Home Heating SystemsHot Water Working

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Viessmann Vitodens 100 F4 Error - No Heat