Hey guys, been a long time since I been on but now I need some help. My emerald classic 699 is now 11 years old and up to a couple of days ago still working fine. I added water to it and the next day I noticed that on the bottom of the digital display three little dots were flashing. Right to the owners manual and it said to try operating all the valves which I did. Also try cleaning the filter and shutting the power off and recycling it which I did. Now the tub won't heat even though the temp light is on. Called dealer who said it might be a pressure switch which I can't find or a possible air bubble. opened up pipe to let water out and get rid of any air. Still no heat and the 3 lights are still flashing. Any ideas or suggestions before I call a tech?