I don't know how old your boilers are, but I've seen some pretty old ones that still told you what was wrong.

They're either off on flame failure, off on some other fault, and there's either an indicator light, or a light that flashes a code, or a little screen that displays an error code.

When you reset it cancels the code.

I would check the condition very carefully before resetting. It seems to be tripping some kind of safety.