UK Appliance Repair Questions? Ask a Technician for Answers ASAP
Four flashes indicates there is a problem with the draining of the appliance. First thing to do is pour a kettle full of boiling water into the base of the appliance with the filters out, leave for about three minutes and then do a pump out. Then start on the hottest program and tell me if that has cleared the problem.
OK this is the part of the cycle where the dishwasher pumps out the water, usually right at the start before it fills, after the wash program and during the rinses and finally at the end. This is a timed period of the program. What often happens is that grease and debris partially block the pipe enough to make it overun its allocated time and it then thinks there is a problem and generates an error code ie 4 flashes.