Keeps popping up and switching the damn thing off basically. It was a new
immersion fitted in November and worked fine until a week or so ago at which
point I found no hot water and the button up. I reset it to get a bath but a
couple of days later it was up again and so on until now. I imagine all this
can be is a separate thermostat from the adjustable one with a single upper
limit temperature at which it deems things to be too hot. I've now tried
reducing the dial setting down a bit from the max (70c) I'd had it set at to
see if this helps.

Is there any adjustment inside these things or any likely reason why it
might have started playing up so soon?
--
Dave Baker

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "Dave Baker" saying
something like:

Is there any adjustment inside these things or any likely reason why it
might have started playing up so soon?

Too soon for limescale build-up, so it might simply be the safety
cut-out is too low and it's probably non-adjustable. Try another one, if
it's removeable.

In article ,
"Dave Baker" writes:
Keeps popping up and switching the damn thing off basically. It was a new
immersion fitted in November and worked fine until a week or so ago at which
point I found no hot water and the button up. I reset it to get a bath but a
couple of days later it was up again and so on until now. I imagine all this
can be is a separate thermostat from the adjustable one with a single upper
limit temperature at which it deems things to be too hot. I've now tried
reducing the dial setting down a bit from the max (70c) I'd had it set at to
see if this helps.

Is there any adjustment inside these things or any likely reason why it
might have started playing up so soon?

What makes you think it's faulty?
It's a safety device to protect against overheating.
My first assumption would be that it's doing exactly
what it's designed to do, before assuming it's faulty.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

"Andrew Gabriel" wrote in message
...
In article ,
"Dave Baker" writes:
Keeps popping up and switching the damn thing off basically. It was a new
immersion fitted in November and worked fine until a week or so ago at
which
point I found no hot water and the button up. I reset it to get a bath
but a
couple of days later it was up again and so on until now. I imagine all
this
can be is a separate thermostat from the adjustable one with a single
upper
limit temperature at which it deems things to be too hot. I've now tried
reducing the dial setting down a bit from the max (70c) I'd had it set at
to
see if this helps.

Is there any adjustment inside these things or any likely reason why it
might have started playing up so soon?

What makes you think it's faulty?
It's a safety device to protect against overheating.
My first assumption would be that it's doing exactly
what it's designed to do, before assuming it's faulty.

Well something is faulty by simple logic or it wouldn't be switching off
like this. Either the variable dial thermostat has failed so the overide is
cutting in to genuinely prevent the water getting too hot or the override
has failed, or is set too low, causing it to cut in when in fact the water
isn't too hot. It makes sod all difference to me which of these it is
because it still ends up with me having no hot water until I press the reset
button back in and then wait another couple of hours which is hardly a long
term solution.

Anyway with the dial set at 65c instead of 70c it's still working ok for now
so maybe it's that the override is set a bit too close to the max 70c of the
dial and cuts in when it shouldn't. If so I can live with it because the
last immersion only had a 60c stat which was a bit too cold really and
didn't let me run a full bath. 70c was a vast improvement and I could have a
full bath plus just a tad of hot water left over. 65c as a middle ground
will probably just about do but if still keeps cutting out at that I'll have
to look at getting another stat under warranty. I'll see how it goes for a
few more days at 65c and if it's stable try tweaking it up a degree at a
time until I find the break point. I might also try running it with the
cover plate off the top of the immersion which should keep the top of the
stat a bit cooler. Got to try thinking out of the box with these things.
--
Dave Baker

On Sun, 07 Feb 2010 11:27:16 +0000, Dave Baker wrote:
Keeps popping up and switching the damn thing off basically. It was a new
immersion fitted in November and worked fine until a week or so ago at which
point I found no hot water and the button up. I reset it to get a bath but a
couple of days later it was up again and so on until now. I imagine all this
can be is a separate thermostat from the adjustable one with a single upper
limit temperature at which it deems things to be too hot.

I had a thermostat fail on our heater a while ago - the contacts basically
welded themselves together such that the heating element was jammed
permanently on up until the "over temperature" 'stat tripped.

Not sure what prices are like on your side of the Pond (I'm in the US) but
it's about a tenner here for a replacement thermostat (they're of a
standard design here so all the DIY stores stock them - not sure if that's
true in the UK?)

cheers

Jules

On 7 Feb, 13:59, "Dave Baker" wrote:
"Andrew Gabriel" wrote in message

...





In article ,
"Dave Baker" writes:
Keeps popping up and switching the damn thing off basically. It was a new
immersion fitted in November and worked fine until a week or so ago at
which
point I found no hot water and the button up. I reset it to get a bath
but a
couple of days later it was up again and so on until now. I imagine all
this
can be is a separate thermostat from the adjustable one with a single
upper
limit temperature at which it deems things to be too hot. I've now tried
reducing the dial setting down a bit from the max (70c) I'd had it set at
to
see if this helps.

Is there any adjustment inside these things or any likely reason why it
might have started playing up so soon?

What makes you think it's faulty?
It's a safety device to protect against overheating.
My first assumption would be that it's doing exactly
what it's designed to do, before assuming it's faulty.

Well something is faulty by simple logic or it wouldn't be switching off
like this. Either the variable dial thermostat has failed so the overide is
cutting in to genuinely prevent the water getting too hot or the override
has failed, or is set too low, causing it to cut in when in fact the water
isn't too hot. It makes sod all difference to me which of these it is
because it still ends up with me having no hot water until I press the reset
button back in and then wait another couple of hours which is hardly a long
term solution.

Anyway with the dial set at 65c instead of 70c it's still working ok for now
so maybe it's that the override is set a bit too close to the max 70c of the
dial and cuts in when it shouldn't. If so I can live with it because the
last immersion only had a 60c stat which was a bit too cold really and
didn't let me run a full bath. 70c was a vast improvement and I could have a
full bath plus just a tad of hot water left over. 65c as a middle ground
will probably just about do but if still keeps cutting out at that I'll have
to look at getting another stat under warranty. I'll see how it goes for a
few more days at 65c and if it's stable try tweaking it up a degree at a
time until I find the break point. I might also try running it with the
cover plate off the top of the immersion which should keep the top of the
stat a bit cooler. Got to try thinking out of the box with these things.
--
Dave Baker- Hide quoted text -

- Show quoted text -

If you have an open vented system and your header tank in the loft is
either metal or fully supported plastic the overheat stat is simply a
bit more of nanny state setting new rules.
In my house it would be a case of bypassing the overheat stat. I think
I am wise enough to recognise when the control stat has failed if only
by the bumping and banging of a boiling cylinder. Mind you I wouldn't
have my control stat set that high to avoid scalding the unwary.

The message
from "Dave Baker" contains these words:



Well something is faulty by simple logic or it wouldn't be switching off
like this. Either the variable dial thermostat has failed so the overide is
cutting in to genuinely prevent the water getting too hot or the override
has failed, or is set too low, causing it to cut in when in fact the water
isn't too hot. It makes sod all difference to me which of these it is
because it still ends up with me having no hot water until I press the
reset
button back in and then wait another couple of hours which is hardly a long
term solution.

Anyway with the dial set at 65c instead of 70c it's still working ok
for now
so maybe it's that the override is set a bit too close to the max 70c
of the
dial and cuts in when it shouldn't. If so I can live with it because the
last immersion only had a 60c stat which was a bit too cold really and
didn't let me run a full bath. 70c was a vast improvement and I could
have a
full bath plus just a tad of hot water left over. 65c as a middle ground
will probably just about do but if still keeps cutting out at that
I'll have
to look at getting another stat under warranty. I'll see how it goes for a
few more days at 65c and if it's stable try tweaking it up a degree at a
time until I find the break point. I might also try running it with the
cover plate off the top of the immersion which should keep the top of the
stat a bit cooler. Got to try thinking out of the box with these things.
--

Had this happen with a new immersion heater I fitted myself a few months ago.

Stat was replaced foc without problem by the importers, but I reached
the conclusion that the problem was basically that it was a very cheap
immersion heater (the cost of a replacement stat was almost the same as
the cost of a IH+stat) and the latency on the main stat was probably
considerable. Just turned it down until the limit stat it no longer
tripped. Water was still amply hot enough. Replacement stat is in
storage awaiting a more dire need.

replying to Dave Baker, kalmius wrote:
I've had the same problem, new heater and thermostat fitted and 3 or 4 times a
week the safety button pops up. Water temperature is about 55c so what I've
done is to remove the cover from the heater and hey presto no more trouble!
What it needs is a ventilated cover to let the heat out so I've drilled some
large holes around the circumference of the cover and had no problems since.

--
for full context, visit https://www.homeownershub.com/uk-diy...on-614180-.htm

On Mon, 12 Feb 2018 21:44:03 GMT, kalmius
m wrote:

replying to Dave Baker, kalmius wrote:
I've had the same problem, new heater and thermostat fitted and 3 or 4 times a
week the safety button pops up. Water temperature is about 55c so what I've
done is to remove the cover from the heater and hey presto no more trouble!
What it needs is a ventilated cover to let the heat out so I've drilled some
large holes around the circumference of the cover and had no problems since.

Ok - so it was 2010 - but what a brilliant idea...
You used to be able to buy bare copper tanks without all that nasty
insulation.