Glow Worm 18hxi not turning on. Had an F14 error the day before.

[luzico]

I've got a Glow Worm 18hxi. Initially, after having changed a radiator, it gave me a F14 error. It would raise the temperature on the display up to 70oC and then it would make a noise and stop, showing the F14 error on display. Now the boiler is not even turning on. However, there is power to it and the internal fuse is ok. Any advice? I appreciate your help.
Thank you.

 

[spike.gb]

F14 Central heating flow temperature > 95 degrees. it looks like the boiler could think its hotter than it is due to a thermistor fault

 

[Reg Man]

Probably air in the system.

 

[Ermintrude]

Probably air in the system.

Plus one on air. U bled pump and 3 port on manual for fill?

 

[galaxy_plumbing]

did heating engineer change radiator ? if so call him back.