I have an Ariston Combi Boiler. The red light keeps coming on so I constantly have to push the reset button. Does anyone know if this is just a thrmostat problem and, if so, is it difficult to fix for a novice? Any help would be great!

You probably mean that you have problems with your oil-burner.

You can get into serious trouble resetting it.

I'd suggest you not repeat that, and call service tech ASAP. Likely a
good opportunity for routine service, cleaning and tuning.

J