I have an 01/02 Altlamar Sundance Spa. I have just cleaned the filter as I was getting a FLO flashing message and the heater wasn’t keeping up with the temp (heat symbol wouldn’t come on) When the filter was replaced the heater when back to the orginal set temp as the heat symbol came back one. since then (about a week) the heat will not hold and the heat symbol doesn’t come back on. the FLO flashing is back. all pumps seem to work and pump like normal. is this the flow switch? should the tab on the switch be touching?