Alexwildish

Hi everyone, I have a Canadian spa grand rapids with a V1 control unit / pump. The temperature is reading slightly low, about 5 degrees difference, i.e. when set at 40c the water temperature is about 35c. Does anyone know of an engineers code etc. so that I can reset / recalibrate the thermister etc. I am loathed to send it back to Canadian spa - it is out of warranty and would cost a small fortune. Thanks