My Dishdrawer comes up with fault F1 when it is in standby and not being used. There is no water leak onto the base so the flood switch is dry. Could it be a faulty flood switch? I have just purchased this machine second hand and was told that it did have an F1 fault but it ran fine for 3 washes on each drawer when I installed it and had been standing idle for nearly 24 hours when it just suddenly alarmed and started flashing F1.

Stuart Jenner, October 2011

If it continuous to come up F1 and you are sure there is no moisture present around the RFI filter board (which is also the water sensor) then replace the RFI filter pcb. Sometimes they get corroded from previously getting wet.

Lincoln Appliance NZ, October 2011