baum1267

I have a down east spa with 3 pumps. All pumps are pushing water. When the sensor tells the heater to go on, it runs for about 30 seconds and then clicks off. The error code that appears is "dr" which means that the heater does not have enough water. I need help. I don't live near any one who services down east spas. I have turned it on and off, I have alternately turned the jets off and on.