What should I do if an error code 'HO SE' appears on my washer LED display?
The HO SE message indicates that the inlet hoses have been installed incorrectly, swapping hot and cold supplies. You need to turn off both water supply valves and reconnect the supply hose to the correct inlet connection on the washer. (Page 35)
From the official Electrolux 300 Series manual, page 35
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