Hayward spa heater error

[Pkhpool]

Hi all I have a Hayward spa
Heater which is giving me a 5f error see below I’ve also got low propane not sure if that contributes

 

[ajw22]

It is an SF code and not caused by low propane.

Hayward H-Series Heaters - Further Reading

www.troublefreepool.com

 

[Pkhpool]

Thanks, I just flushed the sand filter and filled the pool to the top and it worked again - I’m closing this as successfully resolved until the next one thanks and happy holidays. I will be reading the post and KB you gave me also thanks