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heat elenemt doesn't work but only sometimes zdt 6053?

I have adish washer ZDT 6053. the heating element does not work during several washes, and just before i throw my hat at it it works again ... but only for a while. so is it Fauly heater,faulty thermostat,a problem with the circuit or what??? and if I get the repair man in whats to say it will work again for only a few cicyles??
robbie morgan, April 2012
remove the pcb from the control panel and check the heater relay solder joints.they have been known to get hairline cracks/bad joints.resolder them anyway and retest.remove element and if it is white with limescale inside this can cause your issue.could be blockage/stat/pcb or low water

CK, April 2012