BoilerFaultCodesTechnical description
In conjunction with Vitosolic solar control unit: Set DHW value 3
What causes this fault?
This fault happens because the main boiler computer has lost its digital connection with the solar heating control panel. It is usually caused by a loose communication cable between the two units or a electronic failure within the solar module itself. When this link breaks, the boiler doesn't know how much heat the solar panels are providing, which can lead to inefficient water heating.
This issue is often more noticeable during the spring and summer months when homeowners expect their solar panels to handle the majority of their hot water production.
DIY fix possible
Locate the Vitosolic solar control unit and check for any separate power switches.Perform a standard reset of the boiler's control panel by pressing the reset button.Check that the solar cylinders temperature settings have not been adjusted to an unusually high or low level.