Harmon ESP code but still operating

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I never sold Harman and have only worked a dozen or so.
I'm am no expert.
Just received a call from homeowner that I serviced last year.
He said after 20 minutes the ESP code is fashing but stove is still operating normal.
I told him to clean the combustion chambers and brush off ESP and be sure the room temp sensor wires are connected to stove.
Any ideas.