I have a 2003 model Cal Spas CS7000 and the heater is not working. The ohm reading on the heater was 10.5 Ohms. I am not getting 230 volts to the heater. I suspect that the problem may be in the circuit board. Since this is an expensive item, i would like to do some more troubleshooting before I purchase one. This model has two "tape on" temperature sensors, but they are difficult to troubleshoot as well. Can anyone help?

Thank you