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Hello! We inherited a hot tub (c.2006 Hot Springs Grandee) when we moved in September of 2020. Everything worked fine until about 3 weeks ago. Same story as many - came out to use the tub and it was lukewarm. My somewhat uninformed troubleshooting so far has involved the following: Changed the filters out for new ones (ceramic Tri-X) to try and eliminate any issues with old/dirty filters causing water flow issues Removed most of the tubes leading up to and leaving the circ pump to check for blockages - didn't find anything. The circ pump is running, water is flowing from the heater return along with Ozone bubbles at what seems like the "normal" rate. Looking at the IQ2020, I noticed that the D9 LED was blinking red (based on this thread, I took that to mean the heater relay board was bad). Ordered a new 77119 relay board and installed it today. No more blinking red light, but still no heat. Checked the resistance across the heater (measured between H1 and H2 terminals on the heater relay board) - got 15.2 Ohms, which I think is within reason (4 kW Watkins No-Fault). I guess that about 13.2 Ohms is probably expected at 230V (230**2 / 4000) LIIM OK and HTR ON lights on the main board are the right colors (green and red, respectively - no blinking). Measured voltage to the heater (measured between H1 and H2 terminals on the heater relay board) is ~230V. I'm out of ideas at this point. I've seen other threads mention ideas about bypassing some pressure switches on the main motherboard? It seemed like that was mostly a temporary solution or part of the diagnosis process, but perhaps I misread(?) I'm running out of ideas at this point - any other things I can try? How likely is it that the Relay board and Heater both failed at the same time? Are there any other ways to determine definitively that the heating element is no good? Cheers!

Hello everyone. I just bought a house with a grande spa from probably the early 2000s. When we bought the house the owner said there was a small break (yeah right, like almost every line and manifold) in the lines from freezing. After 3 weeks of chipping foam away and replacing all fittings and lines I finally was able to test it out. We laid the unit down filled with water and powered it on. Control panel comes on, shows power at the light, and the small motor that pumps water through a 1/4 line to an elbow on the heater runs. Control board has two lights on it. One red and one green. Both are solid. I have read the if the red light blinks that’s when I have an issue. Heater never kicks on. I have 240v at the terminals going to the heater. I am trying to find out where my issue is, to get this running again. I have put this unit in clean mode to verify that jets and lines hold water and do not leak It wasn’t until today that I realized that one of the pumps does not run in clean mode, making me believe that this may be my issue. I cannot seem to find a start up or run sequence for this unit so I am not sure where to go with this. I have read on another post that a jet pump may need to be running before the heater will kick in But I am not sure if this is correct or not It makes sense, because if no water was flowing through the heater it would just keep heating and not push into the tub. Can anyone give me some ideas to check? I appear to have power at the pump that’s not running, but it is not powering.