Broken weir door causing air bubbles in jet.

Broken how? Won't open or won't close? If it is't opening and starving the skimmer of water, then yes you need to do something about it before you let the pump run again...it'll burn out the motor. You could probably just take the entire weir door off until you get a replacement. I ran my skimmer almost an entire year with no weir door before I knew better. It isn't ideal and doesn't do a very good job at skimming that way, but it's better than ruining your expensive equipment.
 
PJ,

If stuck up, just pull it down and put a brick on it to hold it down... If not stuck up, it is not going to cause air to get into your system..

Not an emergency either way...

Thanks,

Jim R.
 
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