Tunze 9004 no bubbles

[Dashylock]

Today I cleaned my tank and had to shut off my 9004 skimmer. After turning the skimmer back on, it is not producing any bubbles. I can see that the pump is working because water is entering the skimmer through the inlet grate but there are no bubbles forming and traveling up the skimmer neck. I have tried adjusting the air knob from practically no flow to max flow without any luck - really am confused here.

Any ideas what is wrong?

[rvitko]

Either the airline has some how been pinched or clogged or the air intake has come off the pump.

[Dashylock]

Ok I will disassemble and take a look at the air hose. ..thanks!