Your model number can usually be found on a data plate on the back, side or underneath of the appliance.
Your model number will be a combination of letters and numbers, sometimes separated by a dash (-) or a slash (/).
For clothes to be washed at the best possible standard the water needs to be sufficiently heated and the temperature needs to be regulated and maintained within a wash cycle, this is achieved via the heating element.
If the heater element is faulty it will need to be replaced in order to have clean clothes again - ForMySpares may be of help with this compatible replacement element that could be yours soon.