88 solid and no blinking

@lydawallis an illuminated “88” showing in the “Estimated Time Remaining” display would indicate that you have entered the test mode successfully. See if this "Press the Pause/Cancel button to exit diagnostics" gets your dryer to display something different. I suggest that you download the tech sheet from here and see what your diagnostics tell you.

Let us know what exact model your dryer is.

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