TURNED OUT THE NOISE WAS CAUSED BY THE VARIABLE SPEED CONTROL MODULE AND THE DAMAGE TO THE CONTROL MOD. I FEEL WAS DUE TO CONDENSATION IN THE AIR HANDLER. THE CONDENSATION I FEEL WAS CAUSED BY THE METAL COATING ON THE AIR HANDLER INSULATION BREAKING DOWN AND THE INSULATION ABSORBING MOISTURE .THE FACT THE FAN NEVER REACHING FULL SPEED WAS MY 1ST INDICATION BUT THE NOISE JUST DIDN'T MAKE SENSE . HOPE THIS VIDEO CAN HELP SOMEONE WITH THE SAME PROBLEM THE UNIT WAS A TRANE 4TEE3F37A1000AB AIR HANDLER INSTALLED IN 2006.
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