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OH and HL error code

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Started up hot tub after a bit of time with it off, started off fine - filled and heated.

then the HL error code displayed suggesting temp was over 48 degrees but it is actually 30 degrees

I have tried off/On, clear filter etc and now when I start it shows the OH error code which again is for high temp then after a while of running goes back to HL.

Tub is a Wellis Jupiter, anyone had similar and have any advice? 


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What control system is in the spa. Post photos of the circuit board and the schematic on the inside cover.

Likely going to be temp sensor. Sometimes on start up if you can be watching the topside when the spa is powered up and it has gone through the PR mode you can watch it "run away". It will start at the actual temp then increase up to the HL temp and throw the error code.

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