Some Whirlpool washing machines may display the error FP. This error code means “drain failure”. If your washing machine is displaying this code it should still have some water stuck inside.
However, sometimes this type of error can be caused by the washing machine erroneously thinking the water hasn’t gone, but in reality it has. This can happen if the pressure system has a fault.
So if you have error FP and you can see water has not pumped out properly try troubleshooting here – Washing machine won’t empty water (stuck full of water). If the water is draining away OK (you can hear it for example) then check out for pressure system faults here – Faults on pressure system
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