One appliance, one clear starting point
A washer that leaves water behind and an oven that loses heat need separate enquiries, even when both happen in the same home. Start with the machine that needs attention first. Keep its model reference, programme and last normal result together so another appliance's history does not become mixed into the account.
When several things change together
Tell the booking team if more than one appliance stopped after an interruption to the water or electricity supply. That shared timing matters, but it does not establish which component needs repair. If the concern involves burning smells, leaking water or repeated electrical tripping, leave the affected equipment unused and discuss safe next steps rather than recreating the event.