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"Flashing FLO" has left the building! :cool: Many thanks again to all who replied. Pic of the full Flow Switch and the new Sundance (Grundfos) Circ Pump. Now, if someone could just describe how to test a Flow Switch with a multimeter, I'd write a complete "sticky" guide for...

But..but...but...you said they so often fail in 3-5 years, I thought Laing was a bad proposition? The Sundance one is already shipped; guess I'll have to take my chances.

Well, even though @RDspaguy indicates that the "slop" I showed in the pic can be normal - I'm going to replace the pump (with the updated 98W version from Sundance - no wait, it's actually made by Grundfos!) because one thing I never mentioned was...the mfg date on the pump from my spa is 2002...

I envy your availability to people who seem to machine for the love of it. In Cali, I tried to have that done on a pool pump motor, but the guy told me outright he'd charge me more than what a replacement would cost... ;)

@JamesW - nothing jamming the impeller but I take it that heavy amounts of slop are abnormal? (That's a 3/16 hex wrench I've got in there to show how far it wobbles.)

I got some vinyl tubing and couldn't get the circ pump to move water, even after I primed it. I found where the hot lead plugged into the board and clamped it while it was running - .49 Amps. Either I got the run capacitor leads reversed when I connected it back to the motor - or something...

Yes, have a multimeter. Pics below. Circ pump that feed into the heater is pulled out of the loop so I can reinstall the run capacitor and figure out a way to see what its head truly looks like without being connected to the heater. Wine corks make excellent temporary 3/4" hose plugs when the...

Thank you both! Sorry about my delay in replying; I had to pause on this until today. Tried using a shop vac to pull air through; also tried loosening the coupling at the closest available jet pump (as suggested elsewhere). But it the coupling I opened must have been the wrong side; all I could...

Thanks JamesW - Switch is definitely facing correct direction. Can't get you a pic of the whole system right now, sorry. No, the paddle doesn't move any perceptible amount when the pumps are on. Cannot feel water coming out of the return inside the spa, if that's what you mean. Circ Pump...

No, it does not, and neither did the old one. Hence, my question # I...is the level of water in the housing typical? (Edit: the pic above was taken with both jet pumps running.)

Howdy all - I have a used 20-yr old Sundance Marin 850 that was installed over four years ago and runs normally - until last week. Symptoms: 1. The dreaded "Flashing FLO" error. 2. The pumps all run. 3. I could feel heat coming from the area below the control panel. 4. It won't heat past the...