https://community.viessmann.de/t5/Brennstoffzelle-BHKW/Error-12F0-Fault-F-195/m-p/588382#M18374 <DIV>Dear,&nbsp;</DIV><DIV>&nbsp;</DIV><DIV>Yesterday,&nbsp; we had&nbsp; scheduled&nbsp; 5 year service from Viessmaan.&nbsp;</DIV><DIV>As soon as your service&nbsp;colleague&nbsp;left our system started to show this error.&nbsp;</DIV><DIV>&nbsp;</DIV><DIV>Error: 12F0 - Fault - F:195</DIV><DIV>&nbsp;</DIV><DIV>Sorry but how can it be that service colleagues come for a scheduled service and leave the system with an error? I cannot understand. Why they didn't check the whole system before leaving. Now as usual Fuel cell is not working.&nbsp;<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Error" style="width: 562px;"><img src="https://community.viessmann.de/t5/image/serverpage/image-id/50205i21C4E24E6CB6494E/image-size/large?v=v2&amp;px=999" role="button" title="1F606632-FF71-4728-AE87-BB1AC604067B.jpeg" alt="Error" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">Error</span></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="App data" style="width: 999px;"><img src="https://community.viessmann.de/t5/image/serverpage/image-id/50206iCD772B8FD48FD97C/image-size/large?v=v2&amp;px=999" role="button" title="Untitled-2.jpeg" alt="App data" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">App data</span></span></DIV><DIV>&nbsp;</DIV><DIV>Please see the attached files. We will be happy that this is resolved as&nbsp;soon as possible.&nbsp;</DIV><DIV>&nbsp;</DIV><DIV>Best,</DIV><DIV>Kiran</DIV> Thu, 18 Dec 2025 15:10:20 GMT Kiran 2025-12-18T15:10:20Z https://community.viessmann.de/t5/Brennstoffzelle-BHKW/Error-12F0-Fault-F-195/m-p/588382#M18374 <DIV>Dear,&nbsp;</DIV><DIV>&nbsp;</DIV><DIV>Yesterday,&nbsp; we had&nbsp; scheduled&nbsp; 5 year service from Viessmaan.&nbsp;</DIV><DIV>As soon as your service&nbsp;colleague&nbsp;left our system started to show this error.&nbsp;</DIV><DIV>&nbsp;</DIV><DIV>Error: 12F0 - Fault - F:195</DIV><DIV>&nbsp;</DIV><DIV>Sorry but how can it be that service colleagues come for a scheduled service and leave the system with an error? I cannot understand. Why they didn't check the whole system before leaving. Now as usual Fuel cell is not working.&nbsp;<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Error" style="width: 562px;"><img src="https://community.viessmann.de/t5/image/serverpage/image-id/50205i21C4E24E6CB6494E/image-size/large?v=v2&amp;px=999" role="button" title="1F606632-FF71-4728-AE87-BB1AC604067B.jpeg" alt="Error" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">Error</span></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="App data" style="width: 999px;"><img src="https://community.viessmann.de/t5/image/serverpage/image-id/50206iCD772B8FD48FD97C/image-size/large?v=v2&amp;px=999" role="button" title="Untitled-2.jpeg" alt="App data" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">App data</span></span></DIV><DIV>&nbsp;</DIV><DIV>Please see the attached files. We will be happy that this is resolved as&nbsp;soon as possible.&nbsp;</DIV><DIV>&nbsp;</DIV><DIV>Best,</DIV><DIV>Kiran</DIV> Thu, 18 Dec 2025 15:10:20 GMT https://community.viessmann.de/t5/Brennstoffzelle-BHKW/Error-12F0-Fault-F-195/m-p/588382#M18374 Kiran 2025-12-18T15:10:20Z