We have a Leisure Time Spa that is approximately 4 1/2 years old. The thermostat readout has been malfunctioning. The temperature will be at 100 for example and suddenly the readout will jump to 114 causing the breaker to trip. The actual water temperature is not 114. This problem has been occuring off and on for several months. We have cleaned the filter cartridge and adjusted the water levels; however this does not seem to solve the problem.