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Or any other ideas I should do or check= If I can find the problem or root cause, I can get a a technician to change the parts.... I just need to find the problem out by myself or atleast find some instructions how to do it. Ofcourse the best solution would be to call to a licenced Viessmann technician. but there just arent any.. ... Mehr anzeigen

Thanks for the reply. Got an electrician to check the compressor - the electircal resistances are OK and does not have a shortcircuit . The pump has been working now for 5 days but I got the A9 error again.. Seems that pressing one or all of the three relays, it starts starts working again... until the next time. The problem still persists and unfortunately no service technician has been able to come and check the system - they just dont deal with Viessmann heatpumps anymore. I am in contact with one company but they do not have the service manuals (they used to do Viessmann pumps ) and are now in talks with the Viessmann as I understood. But still, they dont promise anything as the pump itself is old ... Does behaivour like this show that the pump or the compressor is finished and needs replacements..? Or could there be anything else wrong? Some valves maybe?(the company I mentioned, had some knowledge of valves creating similar symptoms) Anything else I should check? ... Mehr anzeigen

Thank you for a quick reply. Unfortunately the service providers I have contacted are not capable of diagnosing the device or do not handle Viessmann products any more. So at the moment Im completly alone with the problem Would it be possible to contact you privately to explain the situation a bit further and maybe get some instructions for help from you? ... Mehr anzeigen