This could be for a couple of reasons.
- You should first check that the cord from the pump and the cord from the element are plugged into the control box fully and the correct way around.
- Ensure that the temperature probe is pushed fully into the thermowell and sits tight. If not, you could apply some thermal conducting paste to the temperature probe and then insert it into the thermowell.
If this still does not work let us know and we will guide you through the next course of action.
