Doyle Posted October 21 Share Posted October 21 I installed the Viallant Air to Water HP. When the temperature outside dropped below 4 degrees C, it has the error F.1 100 electric backup heater SCO has tripped Link to comment Share on other sites More sharing options...
JohnMo Posted October 21 Share Posted October 21 Do you have an electric backup heater? If you do I would be switching of the control of it in the controller. Link to comment Share on other sites More sharing options...
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