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Open vent vailant 415 F22 error?

Hi. I have vaillant 415 open vent boiler. I do get an error f22. I did tryed to bleed all radiators, cheched pump and works fine, runned P0 to get air from system not sure what else I could do before I will call to the people who installed boiler. Any suggestions are welcome.
Thanks

Don
September 2015
VaillantHeating, Home Heating SystemsF22 Error Boiler

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