This recent spurt of steamy weather got me thinking about taking a nice
cold shower, but it seems our electric shower has other plans. With the
dial at its normal position at 4-5 the water is nice and hot, just right
for a normal shower. With the dial at 0 though, the water is nice and
hot, just right for a normal shower! I haven't tried it with the dial at
10, for the sake of my skin. Water pressure is fine and I've had the
front panel off and a cog on the back of the dial engages another cog on
what I assume is a large valve and the cogs mesh together as they
should. Before I splash out on a new shower, does anyone know what might
be wrong, and does it have a DIY solution? The shower claims to be a
Gainsborough Swift.

Matt.