need help for renault kangoo

[nany]

hello everyone i have a probleme with renault kangoo diesel ,the car somtimes when switch on he display preheating errors in dashbord but somtimes i just to switch off the errors gone maximum 2minute and it will appear i effect the diag there is no deffault ,i think the problem result in the Ecu box:questionmark: but i dont want open it without to consult this forum.for anyone have an idea please tell me your suggestion what i do .
any help would appreciated
regards & thanks in advance