I have a 7 year old Clearwater spa. When I turn the tub on, it goes through the power cycle then immediately shows an OHH error code and does nothing else. The water is around 50 degrees now.
The manual says "OHH = Overheat. Spa has shut down. One sensor has detected 118º F. at heater."
After researching that, a heater overheat condition that generates an "OHH" Error message is most likely the result of a Low Flow Condition. But could be a number of things.
If I press the Jet 1 or Jet 2 button, one of the pumps does turn on momentarily, but then shuts off. I can hear it and can also see a little bit of water movement when it happens out of some of the jets.
I have two 56 frame waterway pumps and I think the closest one to the heater is a 2 speed with low speed acting as the circulation function because there is plumbing connected directly from the heater to this pump. Also, I just replaced this pump a year ago.
I'm hoping to get some hints or tips about how to determine if I really do have a low flow condition. If so, in which pump. Or if I have a bad element, problem with the heat sensors or a relay issue.
If I do have a low flow condition, could it be either pump that is causing it, or just the pump closest to the heater?
I'm reluctant to believe it is the low flow issue because when I turn the spa on, the water in the element would have to heat from 50 degrees that is at now to 118 degrees in under 3 seconds.
It is hard for me to believe that the element could heat up that quickly, but I just don't know.
Thanks in advance for any advice you have.