I have a heat-pump in my master bedroom that is just over 3 years old and its started making clicking noises in the early hours of the morning.
And this is the crazy thing it only happens in the early hours of the morning always between 4am and 6am.
I had the heat pump installer around to look at it and he couldn't replicated the fault (because it never happens during the day time!)
I suggested he spend the night :-)
I thought I would throw it out onto Geekzone if anyone has had this issue before or works in the industry and is a bit more clued up than my installer that can help lead to speedy resolution?
Fijitsu heat pump still inside the 6 year warranty.
Recording below taken at about 5:30 am: