Lincat IH21 Installation, Operating And Servicing Instructions page 7

The following symbols are observed through the ceramic glass:
Low temperature hold
The pan base temperature is monitored through the hobtop, allowing dishes to be kept
warm. The 'u' symbol is displayed. The food type, flatness of pan base and pan
material will have a significant effect on the temperature of the pan contents, therefore
to comply with food minimum safe holding temperatures, lids should be fitted and a
temperature probe used frequently.
IS 519 ECN 3681
Low temperature hold
Power level setting (1-9)
Power boost function
Automatic heat up control
Control lock function
Pan detection (no pan present)
Residual heat display
Error codes - generator
Error – rotary control (lightning symbol)
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Fig 3