Over-Filling
I just found this advice on another site wondered if it might have any bearing on your over-filling problem:
Reset procedure for recent Hotpoint/Indesit machines.
1. It is recommended that the appliance is not tilted > 45° to gain access to the underneath of the appliance if water is present in the drum as this may also effect the water level readings.
2. If after any repair to the appliance the machine has been tilted >45° i.e. Tank change - pump/sump hose inspection -Pressure switch hose disconnection, or the Pressure switch has been replaced the Pressure switch must be re-set to zero level.
3. To achieve a Zero level reading on the pressure switch manually drain all water from the appliance via the drain hose by lowering it into a suitable receptacle, disconnect and re-connect the pressure switch hose, this will allow the switch to zero calibrate.
To test the appliance:
Switch machine on.
Open door and fill the drum with approximately 1 Litre of water.
Close door.
Set appliance to drain then start appliance, pump will then drain the water out. Pressure switch & Module now re-calibrated to zero.
NOTE: If the drum does not have water in it the machine drain pump will not run,even if a pump out programme is selected.