last had a call on a imperial fryer, pilot will go off at about 400 degrees, bypassed hi limit worked fine, replaced hi limit unit up to par.... to day had another fryer call pilot ould not stay lit replaced thermopile , nothing, bypassed hi limit, nothing, bypassed t-stat, nothing adjusted pilot flame nothing , proccess of elemination, ROBERTSHAW GAS VALVE. will replaced next day ... fryers fryers, fryers.