There are a few possible reasons for a constant F1 code.
- The float switch isn't wired in.
- The finger float switch is upside down in the housing.
- If using a pendant float switch, the wrong cores have been used - reference the instant label.
- The float has been wired into the volt-free relay (see image below).
- The float switch is faulty.
Please check all of the above and then call support on 0330 9000 999.