Easy fix. FISHER & PAYKEL WASHER LEAKS ONLY WHEN FILLING WITH WATER

On Fisher and Paykel machines, you cannot use just a single cold hose pipe.
Either attach a hot pipe or cap the hot valve.

[@motrepairs]

You can't use a plumbing cap as it is tapered thread where as these are parallel thread, but you can get the right ones for sink taps from bunnings/mitre 10 etc, just have to add a hose washer out of an old hose, cheaper then buying them from appliance retailers.