What does F0 code on my Split Air Conditioning mean?

F0 code means that the Split Air Conditioning is low in refrigerant gas.

If your split air conditioning is low in refrigerant gas, you must only allow a F-gas qualified engineer to attend to the problem.  By law, only a qualified F-gas engineer can handle refrigerant gas in Europe.

The engineer will assess for any leakages or other faults and provide you with a service which will probably include a refrigerant top-up.