DkAlberta Posted October 25, 2021 Report Share Posted October 25, 2021 Hey guys We just purchased a new home that came with a Jacuzzi J480. The previous owners had no luck with this unit. I have spent some time and have it in some what of an operational condition but I am currently at the limits of my abilities. The unit heats up and all pumps function properly. My issue is that the tub over heats. It does not stop heating at the set temp. I have taken an amp draw to confirm the heater is running. Once powered on the cir pump will turn on and run for 30 seconds, then the heater will turn on (regardless of set temp) they will run together for a minute or 2 then the cir pump will turn off, the heater remains on until the sensor strapped to the outside of the heater hits 114F, the heater then turns off for 30 seconds and the cycle repeats. I have checked the circ and filter settings and I think they are fine. I have tried running in Economy and Standard modes, I have tested both temp sensors (they seem fine to me). I am trying to avoid having to purchase a new Control Board but that is my next option unless someone can help me. Thanks Derek Quote Link to comment Share on other sites More sharing options...
cranbiz Posted October 25, 2021 Report Share Posted October 25, 2021 How did you test the temp sensors? Have you checked to see if the flow sensor isn't stuck on? Quote Link to comment Share on other sites More sharing options...
DkAlberta Posted October 25, 2021 Author Report Share Posted October 25, 2021 5 hours ago, cranbiz said: How did you test the temp sensors? Have you checked to see if the flow sensor isn't stuck on? I used an ohmmeter, they were relatively close in resistance. I also checked the log to see what the highest and lowest temp were for the high limit sensor. I didn’t check the flow sensor because I assumed it would show a flo2 alarm if the pump wasn’t running but the flow switch was on? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted October 25, 2021 Report Share Posted October 25, 2021 Stuck relay on the board. Pretty cheap fix for an electronics repair guy. Quote Link to comment Share on other sites More sharing options...
DkAlberta Posted October 25, 2021 Author Report Share Posted October 25, 2021 1 hour ago, RDspaguy said: Stuck relay on the board. Pretty cheap fix for an electronics repair guy. No, all 3 relays change state when the unit is powered off and briefly when the high temp limit is reached. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted October 27, 2021 Report Share Posted October 27, 2021 Then it's probably the main board. Pull the boards and check for visible damage, or debris shorting a circuit. 1 Quote Link to comment Share on other sites More sharing options...
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