mrgto

I meant both sensors have the same part number, what should resistence read if I test with a digital multimeter? Motors all seem fine. filters removed and no difference, guess it's time to call a spa pro?

make that model # MS8000

With filters removed, no difference. the heater is a balboa model # NS8000, both sensors are identical, part # 30382-200402261181. Should I just replace them and see what happens? thx, Brian

Hi Gents: Newbie here, the 2004 master spa had a flo warning, filters removed, water ph & chlorine good, water level high, all pumps function, but still FLo warning. I read about the Balboa heater has a trouble shooting guide online. Turned power off, checked the panel schematic and found that this heater has 2 sensors. Unplugged them and plugged them back in on the circuit board, now have a DR code for dirty water. Main pup now shuts off after a couple minutes. Any easy way to determine, which, if not both of these sensors are bad? Thx Think I can post a pic of the circuit board if needed. Brian