on site, found noisy contactor on rear set fryer, far left fish vat. heat contactor is noisy. will order and return. 12/20/19 arrived, shut off fryer, pull out and unplug. disassemble unit to remove contactor box from left side of unit. with contactor box removed, replace heat contactor for left split of left vat. reassemble. plug in. turn on, no noise from contactor now. heating well. OK for use.