I sent an e-mail to Indesit and got a reply. Here it is:
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Thank you for your email regarding the error on your washing machine.
The error F08 indicates that the heater relay is stuck. This could be a fault with either the pressure switch, heater or the module connections. I would suggest that you book a service call for an engineer to assess the situation. To book a service call please contact the Service Centre on 08709066066. Alternativley, you can use the following link:
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Does anyone know that the heater relay and pressure switch is located?
Simon
October 2005