Hi all
update on this:

On Mar 1, 9:42*pm, Ed Sirett wrote:

I will experiment a bit with trying the shower during the day. Any ideas
how the low pressure sensor might work, anyone?

Probably a bad sensor.

Generally they are a tough rubber diaphragm, a spring and a micro switch.

I did a bit more checking and it seems that on some of the Triton
models at least there is a design fault which causes the micro switch
to loosen from the PCB tracks. Armed with this knowledge I took a
closer look. This wasn't the case on my sample, but the way the
diaphragm and connected plunger contacts the switch (actually a
miniature 'pushbutton' switch rather than a proper microswitch) is a
bit vague. I fitted a new stabiliser valve assembly (which
incorporates the pressure diaphragm) a few months ago and there may
also have been variations between samples here. Anyway, I added a tiny
dab of hot melt glue to the 'spigot' of the switch, to make the
pressing more certain. Since then all seems well, hurrah.

Why it was consistently failing in the morning, and why turning on
other taps made a difference, I'm not sure. I wonder if too much
pressure was causing 'off-centre' pressure on the switch. Or the
cooler temperature in the morning was affecting the flexibility of
part of the mechanism. Or something...

Anyway, worth knowing that it seems a common failure point and easy to
address. Triton must know this is an issue but were suggesting a new
PCB at £100 etc. Not impressed.

Cheers
J^n