matt481vs

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2007 hot spring grande I have been experiencing a flashing red light with my hot tub for awhile. Recently, I cleared an obstruction with the ozonenator, which I thought could be the problem, as the drain was not bubbling. Drain bubbles great now. Also have brand new filters installed. After those two things, we used the hot tub a few times with no flashing light for several days, but now it's flashing again. Not sure what to check or replace next. Thanks in advance for any help.