https://community.viessmann.de/t5/Gas/Vitopend-100-W-quot-F5-quot-errorcode-WH1D-control-unit-issue/m-p/308089#M89725 <P>Dear all,</P><P>&nbsp;</P><P>as I notice my boiler is just a bit outdated (installed as neu in 2014). It worked well till recently, when during one night it suddenly&nbsp; stopped with errorcode F5. The service man looked at it and said that the control unit could be wrong. I need advice regarding what the optimal solution should be, as a new replacement part of the WH1D control unit is over 200 €, whereas the used value of the boiler is around 150 €. This model is no longer available in the market, if I was to replace it, I'd have to go for a Vitodens. I have a family hause with 150 sqm living space and 12 radiators. I would not seek to change the complete heating system, as the economical viabilitiy of this option seems to questionable. I would appreciate your kind advice.</P> Wed, 01 Feb 2023 09:09:51 GMT Quasi13 2023-02-01T09:09:51Z https://community.viessmann.de/t5/Gas/Vitopend-100-W-quot-F5-quot-errorcode-WH1D-control-unit-issue/m-p/308089#M89725 <P>Dear all,</P><P>&nbsp;</P><P>as I notice my boiler is just a bit outdated (installed as neu in 2014). It worked well till recently, when during one night it suddenly&nbsp; stopped with errorcode F5. The service man looked at it and said that the control unit could be wrong. I need advice regarding what the optimal solution should be, as a new replacement part of the WH1D control unit is over 200 €, whereas the used value of the boiler is around 150 €. This model is no longer available in the market, if I was to replace it, I'd have to go for a Vitodens. I have a family hause with 150 sqm living space and 12 radiators. I would not seek to change the complete heating system, as the economical viabilitiy of this option seems to questionable. I would appreciate your kind advice.</P> Wed, 01 Feb 2023 09:09:51 GMT https://community.viessmann.de/t5/Gas/Vitopend-100-W-quot-F5-quot-errorcode-WH1D-control-unit-issue/m-p/308089#M89725 Quasi13 2023-02-01T09:09:51Z