kjhi98 wrote:
I'm only getting a very occasional flow of hot water for bathing &
washing dishes from my gas central heating,approx once every month for
about 2-3 hours only.When the water does eventually flow it flows fine
like normal.

Hi

When you run your hot water does the boiler light?

If it doesn't then the fault is probably with the flow sensor.

If it does light, can you check and see if the radiator pipes become
warm. If they do, that suggests the fault is with your diverter valve.

Regards,

Steve