Sent an enquiry to Sanyo Germany about the cooling fan issues that some of the Z1 owners have experienced and got a following reply:

<clip>
although the projector is running in silent mode, but the temperature inside
of the unit is increasing, the fan should run faster to avoid any damages in the projector.
This behave of the projector is depending on the surrounding temperature and isn't a defect.
The switch-on point of the cooling fan is adjustable. After adjustment has been done, the
effect wouldn't appear under 'normal' conditions.
For this adjustment please contact our service station.
</clip>

[Mr Pink]

I for one would prefer the fan on the unit I get to run faster periodically to cool the thing down rather than the whole unit failing. Maybe Panasonic should have included such a feature on the AE100!

[Smurfin]

new firmware resolves this allegedly.

[Timh]

Originally posted by Mr Pink
I for one would prefer the fan on the unit I get to run faster periodically to cool the thing down rather than the whole unit failing. Maybe Panasonic should have included such a feature on the AE100!

My AE100 does have this feature, I run it in eco mode and now and then I hear it speed up to help cool the projector down.