wrote in message
oups.com...

Do you mean an electrically heated shower?

Yes

If so then the chances are the flow-rate is too low for the temperature
selected. If this happens then the water gets too hot and the shower
shuts down for a while.
Detection is either by pressure or output temperature.

Check all causes of low flowrate. I'd start with the showerhead being
scaled up as a first guess, then perhaps a service valve not fully
opened. Or, if it's the sort with a manual tap beneath the unit just
forgetting to fully open the tap each time can cause this - my MiL had
dreadful trouble with our shower 'cos she couldn't read the small print
on the tap (ALWAYS FULL OPEN THIS TAP) with her glasses off - the
default state for showering.
to the man behind the curtain.

Thanks for the advice. What confuses me is that the shower worked
perfectly well for the first few days we moved in, but this is suddenly
a constant problem. I think you're very likely correct about the flow
rate being the problem, but as far as I can see we haven't made any
changes to this.

What do you mean by the showerhead being "scaled up"? Does that mean
it's designed to in some way reduce flow? It's certainly a pretty poor
shower head.
I don't think it can be any of the other things you mention, as we
haven't meddled with anything like that.

It's possible there is an inlet filter and a piece of debris has got into
it. Take the shower head off and run it with just the hose. If it exhibits
the same symptoms, it will be some problem on the inlet (water pressure,
blockage etc). If it doesn't, it's possible the shower head is too scaled up
or something.


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not)