Quote Originally Posted by re-tread View Post
If the slight clicking noise is what you suspect to be the fan in your earlier post. Have another look. It may be the internal distribution valve for the heating. Mine does it and took me a while to work out what the noise was.
Its the unit that changes the flow of air and heat. I had it go on my ZS180. Haven't got round to fixing it as it didn't worry me too much.