Patent ID: 11881362
Assignee: ILLINOIS TOOL WORKS INC.
Field: Furniture, games (Other fields)
Classification: CPC H  A  F  G | IPC A  H

Claim 12:
13. A method of operating a warewash machine that includes a housing at least in part defining a treatment chamber having an access opening, at least one nozzle for emitting liquid into the treatment chamber, a tank including a heating element for heating liquid in the tank, a line running from the tank to the at least one nozzle, a power line path for delivering power to the heating element, and a contactor for controlling power delivery to the heating element, the contactor including main power contacts connected in the power line path and auxiliary contacts that operate the same as, or opposite to, the main power contacts, the method comprising the steps of:
applying a voltage to the first auxiliary contact;
detecting at least one of (i) a voltage condition at the second auxiliary contact or a current flow condition between the first auxiliary contact and the second auxiliary contact; and
identifying abnormal contactor operation based upon at least (i) the voltage condition or the current condition and (ii) a command state of the main power contacts.