My hot tub shuts down with error code "dr" which my manual says is:
Possible inadequate water, poor flow, or air bubbles in detected in heater. Spa is shut down for 15 minutes.
The sequence of events is:
- jets turn on and flow is good.
- about a minute later bubbler turns on.
- about 5 seconds later the heater turns on.
- about 3 seconds later the tubs shuts down with error code "dr"
I was just restarting the tub and there was rainwater that had gotten dirty so I figured there was crap in the heater so I opened up the pipe and looked in. It seems surprisingly clean.
What else can I check before I call a pro?
Should I just keep trying it to see if it will eventually work itself out?