Hi, I’m an electrician with a 2 year old washing machine, supposed 5 year guarantee from Siemens, problem is my machine shows up error F21, when I tried to get a service call I was tols Siemens aren’t covering calls for this fault as it relates to the cold snap of weather we are experiencing, my local shop where I bought the appliance told me to fill the drum with hot not boiling water, no good, I presume there is a way to reset the fault codes on this machine, any ideas greatly appreciated