Just refilled my tub and started it up. it ran for a while, about 20 minutes, everything looked good until the pump stopped and gave me and ICE code. Left it alone, heater started and pump at low speed. Temperature went to 36 degrees Celsius or 97 degrees F no ICE code. Tried starting high speed again ran for a couple of minutes and shutdown. ICE code reappeared. Could the high temperature sensor be faulty or is it something else?