how can i fix my glow worm 30 cxi?

Hi,

I have a glow worm 30cxi boiler and have a problem that hopefully someone can help with.

The problem was that the heating was working fine but the hot water would work for a few mins then go cold if you turned the tap off waited 5 mins then you would get a little more hot water.

I checked with the manual and it said to check the 3 way diverter switch to take it out and see if the spindle moves in and out. I did check this and there was no movement at all. I returned the valve to the system and now the water seems to be better stays hotter for longer but not working how it should butttttt now I have no heating. could all this be due to the diverter switch its just I dont want to pay the £109 + vat for the switch if it isnt that causing the problem.

I have noticed that when you try to turn the heating on the boiler operates as normal but no heat available in radiators but when you turn the heat off the red light appears on boiler and flashes f14 for a few seconds,

Any help at all would be great

The boiler is approx 2 years old and complete rubbish the amount of repairs on it is beyond relief as listed below.

2 main pcb boards

heat exchanger seals

thermastat

and many other little switches,