Spa Doctor-- Watchdog Error

The dreaded "---" or "----".

What that officially means is the board has a failure and its doesn't know what. In theory it was to occur when the board itself has failed and that can be the case.

Most common its a temperature sensor caused failure. Field experience has taught techs to start with the temp sensor. We are guessing failing sensors just confuse the board. Sometimes we get reports of random temp readouts, or rapid temp readout changes, or OH errors, and THEN ---.

So we recommend start with the temp sensor. See at >Sensors