I've had my LMLM for about 15 months now and it used to be quiet and all of the sudden I hear a small click and the boiler seems to be heating up for 10 secs and again every minute after that.

I spoke to Chris at LM and suggested to replace the vacuum breaker. I did and the this symptom continues.

Any ideas what it could be? All pressure levels good good. 1.5 for steam, 12 for brew.

Thanks