4 flashes indicate a time out fault.your appliance is not draining in the specified time limit.start by checking the outlet pipe for kinks,if the outlet pipe is attached to the trap on your sink then assume a blockage there or in the trap.maybe yours is a stand alone waste?.if all appears ok with the drain outlet pipe.check the drain pump for blockages and inspect the filter.if you follow the grey outlet pipe into the appliance,with panel removed ,the pipe connects to the pump.
ozone, November 2011
