On certain Indesit washing machines, if the on off light is flashing 3 times, with a slight pause, followed by flashing a further 3 times, or if it is displaying F03 you have an error code that is explained as follows –
NTC fault – check Thermistor and module connections
The NTC is the thermistor, which is a modern-day thermostat. It’s sometimes inserted into a tube in the heating element between the main live and neutral connections and sometimes it can be a small round stat close by. It is made with heat sensitive materials that change their electrical resistance according to their temperature. By knowing what electrical resistance the crystals have at given temperatures the washing machines pcb can tell the exact water temperature.
With this fault the NTC is likely to be either faulty (open/short circuit), or there’s a dodgy connection to or from it, or maybe even a connection problem where it connects to the main PCB. How to test an NTC thermistor.
Many faults are best dealt with by an experienced repairman with the right tools and test meters. Find appliance repairs – Book washing machine (or other appliance) repair