JCM Posted October 24, 2023 Report Share Posted October 24, 2023 Hi, I have a 2004 Jacuzzi J375 that I just replaced the circulation pump on and am now getting an OH error code. I did drain the tub for cleaning along with the pump replacement. What I notice is that the circulation pump runs for a while, stops, then I believe the heater starts to ramp up. It sounds like pressurized water/air starting to form and then I see air appear in the flow switch junction. It sounds like a kettle boiling. This is when I get the OH error and at this point I continue to hear the circulation pump run. It feels as though I may have multiple issues. 1 being the pump not shutting off when it should and 2nd that I have air in the system from the draining. Or, it could just be that air is being introduced into the system causing the OH to happen and the cycle to repeat. I have spent hours burping the air out, maybe 20-30 times, and while I can get the air that is gathering at the flow switch out to the point of a solid stream, more appears after the cycle restarts as described above. I have replace the clamps with band clamps and I believe there are no leaks at the joints I have opened any suggestions on what to try next? thanks Quote Link to comment Share on other sites More sharing options...
JCM Posted October 29, 2023 Author Report Share Posted October 29, 2023 I have noticed that one of my air control buttons no longer works. Could that somehow be introducing air into the system? Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted October 29, 2023 Report Share Posted October 29, 2023 You replaced the circ... did it ever run with the new circ or is it new new. Did you replace it with the same voltage (120V/230V) Likely a 230V needed. Please verify. You might want to disconnect the heater from the board until you get things right so you don't go nuclear and burn the house down. Use a multi meter to know when you have power off the board going to the heater. Next time the circ stops when it shouldn't test for power off the circuit board going to the circ. If you have power then it's a circ issue. As for air getting introduced into the system somehow ensure water level is not to high...or low. Jets and air injection are related to the main pumps and not related to the circ heating/filtering system/lines. see below Poet photos of the control system, circuit board and schematic on inside cover so we are on the same page with what you have. Basing my advice on what I think you have but admittedly I have been wrong once before...lol Quote Link to comment Share on other sites More sharing options...
cranbiz Posted October 29, 2023 Report Share Posted October 29, 2023 20 minutes ago, CanadianSpaTech said: Basing my advice on what I think you have but admittedly I have been wrong once before...lol Only once? 😂 Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted October 29, 2023 Report Share Posted October 29, 2023 @cranbiz Yeah and 8 years later he's still in office...lol 1 Quote Link to comment Share on other sites More sharing options...
JCM Posted November 1, 2023 Author Report Share Posted November 1, 2023 On 10/29/2023 at 10:11 AM, CanadianSpaTech said: You replaced the circ... did it ever run with the new circ or is it new new. Did you replace it with the same voltage (120V/230V) Likely a 230V needed. Please verify. You might want to disconnect the heater from the board until you get things right so you don't go nuclear and burn the house down. Use a multi meter to know when you have power off the board going to the heater. Next time the circ stops when it shouldn't test for power off the circuit board going to the circ. If you have power then it's a circ issue. As for air getting introduced into the system somehow ensure water level is not to high...or low. Jets and air injection are related to the main pumps and not related to the circ heating/filtering system/lines. see below Poet photos of the control system, circuit board and schematic on inside cover so we are on the same page with what you have. Basing my advice on what I think you have but admittedly I have been wrong once before...lol Thanks for the reply. I replaced the circ pump with a Laing 230v pump which was identical to the previous unit that was installed. Spec is: 73979 E10 3/4" Laing Circulation Pump 230 Volts SM-909-NHW 73979. The OH has only started happening after replacing the circ pump, it was signalling a flow error prior to replacement and I confirmed the pump was dead by removal and testing. Water level seems to be fine, I have never had an issue with the level that it is at before which is right below the headrests. It was drained and refilled with the circ pump replacement and I did start it up when the water was a touch too low, 2 jets were below the water level. I can't seem to post images so here's a link to the files requested. One is a video which show the air in the flow switch which I spoke about in the first post. That union is where I had been burping air out of the system. https://shorturl.at/PZ348 In that video you can see smaller tubing coming off of the flow switch. Those tubes are connected with the main pumps and possibly more, I can't tell where as they go around the tub and I haven't opened any other panel yet. I mention this because I did open those up when trying to burp the lines there thinking it was a higher point in the system. As I was taking the requested pictures I noted that the tub was at 104 when I had it set to 102. Something is causing it to run hotter vs. it's program. But it isn't throwing an OH error at the moment, that only happens when the cycle starts which is introducing air as noted above. I did hook the multimeter up and it appears as though the heater is not running all the time. I am in the process of letting it cool down below 100 and will restart & retest the heater at that point then post results here. Thank you for any/all help Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted November 1, 2023 Report Share Posted November 1, 2023 can't see video don't have apple or whatever Quote Link to comment Share on other sites More sharing options...
JCM Posted November 1, 2023 Author Report Share Posted November 1, 2023 Do these work for you? https://photos.app.goo.gl/YfEqFxsT6g3r28rm6 https://photos.app.goo.gl/36TAhGjS82U2ASNA9 https://photos.app.goo.gl/tqmVZsyGGzBemoy5A https://photos.app.goo.gl/W3hcQi2T8CdfzTkJ8 https://photos.app.goo.gl/8iFVWP7Y8eniRZCR8 https://photos.app.goo.gl/KRwu4cYLprWHoA6AA Quote Link to comment Share on other sites More sharing options...
JCM Posted November 1, 2023 Author Report Share Posted November 1, 2023 Do these work for you? https://photos.app.goo.gl/YfEqFxsT6g3r28rm6 https://photos.app.goo.gl/36TAhGjS82U2ASNA9 https://photos.app.goo.gl/tqmVZsyGGzBemoy5A https://photos.app.goo.gl/W3hcQi2T8CdfzTkJ8 https://photos.app.goo.gl/8iFVWP7Y8eniRZCR8 19 minutes ago, CanadianSpaTech said: can't see video don't have apple or whatever https://photos.app.goo.gl/KRwu4cYLprWHoA6AA Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted November 2, 2023 Report Share Posted November 2, 2023 Just spit balling here... Try and pinch off the tube that goes into the flow switch from above and eliminate that from the scenario. Again disconnect the heater from the board and eliminate the water boiling from the scenario. You might have to start throwing parts at it and swap in new sensors starting with a temp sensor Quote Link to comment Share on other sites More sharing options...
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