F13 means heater not working. If your machine is more than 2years old the maximum charge by Dyson would be £85. This would include call out, all parts and labour, 1yr guarantee on parts fitted. The engineer would also check the rest of the machine for upgrading specific parts that have been modified free. helpline Number is diplayed on your machine or written on or near the door of the washer.
Dyson engineer, September 2005