the cose SN 1 showed up about a week and a hlf ago. I purchased a new filter and put it in. Afterwards, the code dissapeared and all was good. Four days ago, the same sode reapeared (SN 1). Any suggestions as to what i should try next? The tub is starting to cost me quite alot as of late….IN the spring, I put a new water heater in, and about three weeks ago, I put a new circulating pump in!! Any sort of help would help.
