Flo Light Comes On After Heating

[palhalwa1]

We just replaced our filter in our hot tub and now after heating the flo light comes on. When the water begins to heat up it will read the temp we set it at which is 103. Once it hits that temp and heater shuts off the flo light comes on and not able to use any of the blowers or change temp. I have read that it could have been the filter so put new one in yesterday. Do not know how to check for blocked plumbing. We called our dealer here and they came out and he said he did not know as the flo light did not come on. the heater was not coming on and when it did it would not shut off. That's when we replaced the filter but now as stated it heats up but we have the flo light issue.

Thank you

[Spa_Guru]

The flow light is not just for lsck of flow, it also reads pressure switch errors when the pressure switch remains closed even after the pump shuts down.

This usually happens when the pressure switch is exposed to chems for a period of time and the diaphram inside weakens.

You need to pull both wires off the switch and do an Ohm test across the switch terminals, with the spa power off, if it shows you have a connection, turn the adjusting knob or screw clockwise until it shows you do not.

Post a photo of your switch if you need more details.