Pool and Spa
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yes the dry code indicates that there is no water flow through heater housing and after a few minutes you will get an OH code because the water that is sitting in the heater is starting to overheat the only thing you can do is try bleeding the air out of each pump via the threaded union on the front of each pump also try running a garden hose on full blast down the filter suction hole for a few minutes to try and push the air through then turn breaker back on and see if water starts to flow. It is possible that the pump that sends water through the heater housing is bad and will not run.