Pool and Spa
Questions about Pool Repair? Ask an Expert Online.
Yes DR means that there is no water through the heater. In some cases it just means that the pump has an air lock which is an air pocket inside the pump and it can not push the water through. This usually happens when you drain and refill the spa if you have not refilled it then most likely the pump is bad and you need to replace the pump that feeds water through the heater. If you did just drain and refill the spa then loosen the union on the front of the pump and try and bleed the air out then it should be fine.