examined HOB Dishwasher unit, found wash tank contactor kicks off at 178 when sitting started using and temp slowly drops to 140. turned up booster temp setting to 194. now rinse temps are 186 to 188 this helped wash temp up to 146 when operating found 1 part of wash element not heating will order and return. 3/17/21 replaced wash element cleaned off temp probe filled tank no leaks heated to 180 customer set point started running trays rinse up to 188 wash never went below 162 after 12 trays element drawing 45 amps per leg all 3 all okay.