Hot tub code OH

[Glamper]

I have an older Cal-Spa & recently started getting an OH code.
We have tried powering down & re-energizing.
We have earned the inlet screen & we have removed the filter (Ordered a new one to be delivered 11/1). Still, we get the OH code.

Any thoughts / help?? Thanks!!!

 

[Jimrahbe]

G,

Well, I assume that your spa's controller thinks the water temp is too high.. OH or Over Heat.

Your water may not be too hot, but all that matters is what the controller "thinks"..

I suspect that one of your temp probes is bad.

Let's see what @RDspaguy has to say..

Thanks,

Jim R.

 

[JamesW]

What does the temperature display on the screen?

What is the actual water temperature?

Do you have good circulation?

 

[JamesW]

I have an older Cal-Spa & recently started getting an OH code.

What year and what model?

What spa pack do you have?

 

[RDspaguy]

have an older Cal-Spa

Not really helpful. Post pics of equipment area, circuit board, and wiring diagram so I know what you've got in there.
Overheat errors are usually flow related (pump, filter, etc) or a stuck relay on the board, though it can be a sensor. Details on when it overheats will help narrow it down.