maverick23

This time, the unit won't stop heating. I have the temperature set to 99, though the deckside display shows the temp above 99, and the low speed pumps are still on even though I have them off, as though it was attempting to heat itself above the set temp of 99. The heating indicator light is NOT on when this is occuring. Since it is actually overheating I presume, I just switched it off. Any ideas?

Picking this up, the problem returned this morning for the first time since January. It has hit OH 3 times today alone now. It is in the 70s F where I am. Does the 6 month code-free period indicate anything? Thanks in advance

Following this up - although I don;t believe in problems simply disappearing, my spa hasn;t faulted in probably 6 weeks now. I suspect it may have something to do with a stuck relay in cold ambient temps, as we had a bit of a freeze at the time. I say this simply because I can't think of anything more sensible.

I'm having a similar problem on my balboa, except I can run from one to five days before it goes OH. Any ideas on how that changes the situation?

And my board is a Cal Spa/Balboa 52934 - http://www.spacare.com/calspaliteleadercircuitboard52935.aspx

I think you are right about being able to unstuck the relay. I turned the heat down by about 20 degrees, so in theory, the heater will not have to activate. If it doesn't fault until it falls below the set temp then this pinpoints the relay or the temp sensor, I believe. If it is the relay that is getting stuck, and it 'stuck' mechanically, I'm not sure I understand how either resetting the breaker or simply pressing the temp button to clear the OH code will fix a mechanically 'stuck' part. If it responded to the button, that would suggest that it works pretty well? Although, I have not been listening for a 'click' sound. And, one time (out of 10 or so), pressing the temp button did not clear the OH code immediately, so that may suggest it was stuck in that instance. Thanks for all your help!

Good tips - I will test for that when/if the rain and wind stop. FYI I believe my spa is at least 15 years old. I purchased it used from a local refurbisher with a pretty good reputation who offers a 30 day warranty on all of their units. I am at about 150 days. If the relay is getting stuck - I am looking at a new board, right? IMO that is something the refurbisher should have caught. Is that a realistic point of view? Thanks for the help!

<if there is voltage in this case, what would that indicate? faulty circuit board?

Update - I replaced the filter, then reset the circuit breaker. It ran normally for 5 days, but then went 'OH' again. Still not tripping the breaker. This makes little sense - anyone experience something similar? Only guess is the high limit temp sensor, but 5 days of no issues seems much too long. I am not sure of the filter frequency setting but it is every 12 hours at the least, maybe more often.

I have a Cal Spa of unknown origin - after letting it sit and neglecting the filter for about 2 - 3 months, came out to see OH code flashing and water was ambient temp. Nothing tripped - pressed the temp button to adjust temp and it started heating, low pumps activated. It would eventually heat back up to specified heat, but a day or two later OH would flash again and the system shuts down. Deep cleaned the filter, Oh came on again about 2 hours after reaching temp (90F). Running now without filter. Any ideas? The temp readings have always been accurate.