How to replace diverter valve cartridge / Leaking diverter valve on Glow Worm Energy boiler

How to replace diverter valve cartridge / Leaking diverter valve on Glow Worm boiler step by step
This video is for GAS SAFE ENGINEERS only, always follow manufacturer instructions.
Before to start any work on gas appliance isolate the power, turn off the gas and the waters.
Pressure sensor is faulty because there is 1.5bar pressure on the boiler and the boiler is giving F75 fault code
1. Download manual
www.glow-worm....
2. Remove front cover
3. Isolate the cold water, flow and return valves
4. Drain the boiler
5. Leave open the drain point
6. Remove diverter valve cartridge
7. Insert new cartridge
8. Close the drain valve and open the flow and return valves
9. Re-pressurise the heating system till 1 - 1.5 bar

[@hemi4052]

How to diagnose damage of that valve? That we know it need to be replaced

[@bheating]

It came on the radiators when the boiler was on for hot water. The Diverted vave was letting by.