F7 may be caused by a faulty float level switch on any Hurlcon Astralpool Viron gas pool heater. It can also be caused by corrosion or other issues. This is a replacement float switch. Rated for higher temperatures than generic parts. Part 78140. Note that heater cast base must be checked for corrosion or other issues.
These can be very difficult to remove when corrosion is present.
OEM part. To be fitted by qualifed persons only.