Georgina Gibson

@ratchett...the tub is in direct sunlight but covered ... the heater was actually in direct sunlight also as we are re-doing the deck around it so it was uncovered. Sun definitely could be a contributing factor.. we are in New Mexico so days are pretty warm.

Hi There, My in-ground hot tub has started heating beyond what it is set to and I am not sure why. It gets to 105-106 before switching off. I initially had it set to 104 but I have turned the thermostat down to 100 and it still does it. It went all the way to OH once (couple of weeks ago) but is usually around 106. The pump is running a lot .. presumably because something is calling for heat. The control board is a Balboa VS-500Z I have cleaned the filter and I currently have the filter cycle set to F2. I also changed from St to Ec mode but that hasn't made a difference either. I have attached a few pics in case they are helpful. Any ideas of what I should check next ? Thanks!

Success! Powered up and everything now runs smoothly. Tub is now up to 104 and happily maintaining temp. Thank you so much for you invaluable help getting this figured out!

Ok.. This was super helpful. It turns out that the old pump was 120V but my new one was 240V so needing to move the wire from W1 to red AC makes total sense. I didn't update the blower (although it looks ridiculously old) but it looks to be 240V also. (I attached a pic) so I think that wiring was inherited wrong and have moved the white wire from W7 to red AC as well. New pic of circuit board with wires moved to red AC attached. I have attached the pic showing the other side of the inside cover that details the dip switches. So far only dip 3 is 'on'. Any advice on if these should be changed would be much appreciated. I'll wait to hear on the dip switches before I power it up again. Thank you!

Thanks so much for your reply. I will give these suggestions a try and get more pics tomorrow as soon as I have enough light out there.

Ok. Here are a bunch more pics. Sorry the circuit diagram is a little black - had a relay blow about 3 years ago. Circuit board was replaced at that time). Before we re-plumed and moved the pumps/controller etc. out of the dirt onto a platform things had been mostly operating fine except the pump we replaced was noisy and had been running a lot more than normal.

We have just re-plumbed (and re-surfaced) an older in-ground hot tub that was on the property when we moved in -we replaced most of the pipe and as well as the 2-speed pump. But we just cant get the new set-up working properly. We have had a variety of error codes (HH/LF) that indicate a low-flow but just cant figure out the ultimate cause. We have a brand new filter in there (and have checked it frequently), the water level is above the intake, we have bled air from the pump, and we have also replaced both M7 temperature sensors in case they were the problem. I am hoping someone has other ideas of what to check. Here is what happens: After re-setting at the breaker, the pump appears to complete its priming cycle, we get temperature displayed, and the pump seams to be circulating water (can see/feel output at the jets). Then..after a short while the pump stops running and we hear the heater kick on.. which then leads to the HH/LF errors - presumably as there is no flow when the water is getting heated. So it seems the pump and heater are out of sync but I don't know why or how to fix. Another mystery that may or may not be related... the faucet before the pump was to help bleed air/drain ? from the system (This was in the original set up so we simply replaced). When it is slightly cracked open the pump appears to draw more water and the jets get more vigorous (water doesn't come out the faucet). If we open it further water will then start to come out... is this some kind of pressure issue? I have included a picture of our set-up. Thanks for any suggestions!