Potterton boiler help please

[LIZS]

Can anyone offer any help hereplease ! Kids are moaning their radiators are cold

Have you bled your radiators lately?

Potterton publish their instruction manuals online, but I cannot see Prima F. Are you sure it's not a Suprima HE? You may find that the controls are quite similar anyway.

Otherwise, agree with the other posters, most likely:
broken thermostat,
feeder and expansion tank needs refilling (instruction manual should tell you how to do this), and/or
air in the radiators (usually get hot at the bottom, but remain cold at the top).

Good luck!

Cheers , it is operating now as long as we don't turn the boiler setting up. Suspect it is the thermostat as water hot even at a low setting.

Yep - sounds right. Well done!

How urgent an issue is it to sort out , bearing in mind we do have heating ? British Gas service due in about March/ April

Could it be the batteries in the thermostat (if it is separate from the boiler itself)?

Don't mean to alarm but is this the thermostat in the water tank itself? Only that can be very dangerous as there isno cap on how hot the water will go.
I might be completely on the wrong track.

No would be thermostat on boiler I think, as that is what cuts out, not one on hot water tank (that is fine if set a bit high ).