I have had the boiler installed 5 years ago and changed the sensor 3 times in the last 3 years. I increase the pressure slightly everytime F9 Is shown , the boiler then starts. The pressure in the system is up to 1.9 bar now.
I went to get another sensor from my plumbers merchant, I was advise to go on line to find out if anybody knows a permenant solution to the problem or how to clean the sensor.
thanks for any advice.

Raynite, September 2017

Acp- Thank you for your advice. I will look in to it.

raynite, September 2017

https://www.diynot.com/diy/threads/glow-worm-flexicom-30cx-that-displays-the-f9-fault-code.284777/

Point of interest: Glow Worm offer fixed price repair about £
300 for a one off or about the same for a service contract minimum term, which gives you an annual service as well. May well be worth investigating

Acp, September 2017