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This means you have a bad thermistor in this, the only way to repair it is to replace the thermistor, you can order the part at the link below.
If you are mechanically inclined and have the tools you can do this yourself, it's located on the blower assembly inside the dryer and is part number W0035 on this diagram. Need to open up the machine to get to it, below is a link to all the diagrams to help you.
diagrams , thanks and best wishes, Bryan