Hello,

what his sign indicate is that there is disconnection of power connection over to the element i.e the heater (heat provider).

what you need to do to fix up this problem is to open (unscrew) it then trace the wire down to the element inside the system it self the element is silver in colour fix up the wire back, to the back of the element then with this the problem of the error message is solve. disconnect all source of power supply to the connected to it .

thank you.