Recommended you take it out and blow fan with can air. If the fan is good then you will need to replace the circuit board:( mite order a new fan first and connected then you will know if you have to order the board unless you fill confident to locate the main board and then locate the connector on it. unless some one has unpluged the connector doubt it is lose or bent pin inside it. Best to ask for a pansonic servive provider.
Btw, I’m available to help over the phone in case u need at
https://www.6ya.com/expert/normanj_7893313f0751935f
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