dUSSEL

Hi My Sovereign Hotspring (around 2005) have some trouble. When I plug it, red lihgt starts flashing after 2 to 20 minutes. I have a 1Q2020 board. D12 control unplugged is steady ON I have checked the LIMTHERM value and it is 7k ohms. Water temp is 33°C (91°F). Ambient temp is 25°C (77°F) Do you think 7k ohms is a good value ? What should be the normal value ? any other tests I can drive ? Thanks