heater making knocking noise?

  • We are currently upgrading MFK. thanks! -neo

alltest400

Feeder Fish
MFK Member
Jan 20, 2009
29
0
0
stourbridge england
just replaced my heater in my tank with a new one, after a while i noticed a knocking noise coming from the tank, and at first couldnt figure out what it was. after a while i decided to unplug the heater to see if it might have been that, and the noise stopped. is this normal for a new heater, as i dont remember this happening with any of my other heaters. the new heater is a fluval M300, thanks in advance for any help.
 
did you notice the notice constant?? try checking to see if the knocking sound its in time with the light on your heater indicating its on or off

2 of my heaters make a fairly loud noise every time the light goes on or off
 
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