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Just took another look, there’s a flow sensor just after pump and then one after heat exchange unit, the sensor after heat is working but when flowing there isn’t enough pressure to push the magnet up to sensor? What’s it more likely to be not enough flow or the sensors sticking?

Error code was on prior to replacing parts. Control board is similar price to new overall unit. Will look for a second hand one

Hi, i have an intex spa with error code E90, which means no water flow. the problem is that the water is actually flowing. The motor is turning the spindle inside for impeller usually wears or breaks this has been replaced and so has the impeller. There are 2 water flow sensors on this pump...