odd fault.my thoughts immediately turn to tablets,some dishwasher tabs generate a helluva lot of foam depeding upon the water hardness in your area very prone to happen in soft water areas.try using loose powder only.it will prob benefit from a dishwasher cleaning additive as well.Finish make an excellent liquid one small plastic bottle blue or orange i colour but bin tne tabs 1st assuming you ae using them bet you are.
andrew
July 2008