Do nothing on a brand new unit but let the installer or service tech fix it for free, if you go messing with it you may camoflouge the real problem and when the repair tech arrives he wont be able to observe the actual cause or fault and it will do it again after hes gone and you'll be back to square one. please don't touch a thing till the tech arrives and gets the chance to see it broken and use his tools to determine the problem. good luck.
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what does f99 indicate on your booklet?
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