On Monday, 27 May 2019 18:05:56 UTC+1, ARW wrote:
The conditioner compartment has a rounded cap over a tube, which forms a
syphon, remove the cap and soak it in hot water to de-gunge it
occasionally.
Sometimes it's just worth doing the hottest wash possible with no load.

AFAIK the water is heated inside the drum. The detergent syphon only gets incoming cold water.

Unless yours is plumbed into the hot, of course.

Owain