... the power, the power lamp is light ,ratate clockwisethe tempera ture cont rol le r, at the moment ,t he gre ... begin towork,When the temperature rise the neededtemper a ture, the tempera ture cont rol l er auto cut off the power ... t ube s top working.Whentemper a ture f al ls , the t emper a ture control ler auto connect the powe ...