This dishwasher is stuck on wash and heat with no water suspected a blockage ,metering tank and hoses all look clean even though customer has never used cleaner ,what seems strange to me is the 3 term microswitch is o/c in the norm closed position tried shorting it out but no joy also this thing has got the largest diameter aqaustop hose i have ever seen there is a pressure hose alongside it as it comes from the inside to the back panel then pressure hose seem to terminate at panel what does it do and were should i be looking for blockage any advice welcome