etc22

It's on the main circuit board and it is only lit up when the heater goes off. It's an LED labeled D17

Thanks for the quick response. I can do the easy stuff - check/change the filter. Not so sure on the pressure switch or thermistors - but if there's a Youtube video of it I can do anything. They're sending a different tech out on Monday so maybe I'll get a better result. I am interested on what the D17 LED is when the heater is off. I don't have a stereo but there is a light in the spa - it seems I recall reading something about other spa electronics being an issue. Thanks again.

I have a 120V 05 or 06 Tiger River Bengal Spa that the heater will shut down intermittently on. If I unplug it and wait a few minutes and plug it back in it starts back up fine and may go for 2-3-4-X days and then it shuts down again. The indicator I get is the blinking power light on the control panel. If I check the circuit panel the only lights that are lit is the D17 LED which is red. I'm the original owner and we have not had any issues until last summer when it started doing this. Because of this we didn't use it much and all I did was make sure I rest it every few days so it didn't freeze over the winter. I've had a tech out to look at it - he first told me it was a flow issue because of slime in the lines and told me to run Clean Start through it, clean the filter and drain and restart. He said that would take care of it. I did that and it ran for 3 days and the heater shut down. I called him back out and he said he couldn't figure out why it was doing this but changed the circ pump to see if that helped. It didn't - it ran for 4 days and shut down. When it's working the Hi Limit Light is red and the Heater Power light is green and no other lights are on. I have little confidence in the tech that has looked at it and am notgoing to keep paying for service visits that don't do anything. Like I said when it's shut down the only light I get is the D17 LED. Is there something about this that tells me anything?