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Loud intermittent Metallic sound from Heating Unit

2K views 2 replies 2 participants last post by  uy7473 
#1 ·
Hi,
From couple of days, a metallic sound like (bell ringing continously) comes from Heating unit when it is blowing the air.

The sound doesn't come everytime the Heating unit start blowing air, it is coming intermittently.

Please assit.

Thanks
UY
 
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