To balance device wear and tear,
- If only one drain pump is required, use the fault-free one if the other is faulty. If both can work normally, run the one with less operation time, which can then be switched to the other one if it encounters errors during operation.
- Switch to another pump forcibly every a set period of time. When both drain pumps can work normally but only one is required, set a time interval, for example, 6 hours, to recalculate operation time of both pumps and reselect the one with less operation time. Doing so can prevent the system from not using or keeping running a drain pump for a long time.