Flow switch

[nicksterv]

Hi, new to the forum, very usefull, I am having trouble with FLow error, the flow switch seems to be working, I get a solid FL, which is supposed to mean that the switch is bad, but when I jiggle it a bit, it will start up the pump again, it will work for a day maybe, then I will get the message again, I wanted to change the switch, but when I disconnected it, the motor pump still works, I don't think that it should be, filters are clean.I hope I am explaining well. Beachcomber spa, balboa board, 2000 digital, 2004.If it is not the switch, how would I check the relay.I don't mind jiggling the switch now, but up here in winter temperature is mostly below freezing, I can't take a chance of the tub not running. Thanks

[Kev B]

 I recommend new wire harness and pressure switch. Don't take chances with winter on the way. Any fl issues after that will mean a bad board connection, assuming you have proper flow to begin with.

[clover]

your symptom is symptomatic of a bad flow switch.  To confirm this condition you can do 1 of 2 things, use an ohmmeter to measure the resistance of the switch when it is OPEN and should read infinity as an open switch, OR 2, you can unplug the sensor loom when you have or see the flow message, and then immediately plug it back in.  The flow message is gone and everything returns to normal operation.  That is, until it cycles off and the flow message will return.  What is happening is the circuit board "knows" the switch is bad, and it is protecting the unit from additional damage to your system.

Using an ohmmeter, you will find that the switch is NOT opening when you can actually see that it is open, and it will prove to be unreliable until it is replaced. 

Do it.