I have a Worcester-Bosch Heatslave 12/14 When the hot water is on but
the heating is off the rads can get very hot (if hot water is set full
on) any ideas whats going on?

Kerry

fancyabrew wrote:

I have a Worcester-Bosch Heatslave 12/14 When the hot water is on but
the heating is off the rads can get very hot (if hot water is set full
on) any ideas whats going on?

Your three port/zone/divertion valve is probably stuck...

A bit more informationon your system would be required to tell you much
more.

--
Cheers,

John.

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fancyabrew wrote:
I have a Worcester-Bosch Heatslave 12/14 When the hot water is on but
the heating is off the rads can get very hot (if hot water is set full
on) any ideas whats going on?

Kerry

too many possibilities, too little information

"fancyabrew" wrote in message
oups.com...
I have a Worcester-Bosch Heatslave 12/14 When the hot water is on but
the heating is off the rads can get very hot (if hot water is set full
on) any ideas whats going on?

Kerry


Check that the motorised valve hasn't failed. Happened to me last week.


John

Ok little more info.

Heatslave 12/14. 5 rads in total on three floors, boiler in the
basement with three rads on ground floor and 2 on first floor. Heating
works fine as does the hot water. If the heating is turned of
completely, but I have the hot water turned on, the rads can get VERY
hot, especially if I have the hot water turned up to 5 for running a
bath etc. Bolier has been in for about 2.5 years , pressure is fine.

In an earlier contribution to this discussion,
fancyabrew wrote:

Ok little more info.

Heatslave 12/14. 5 rads in total on three floors, boiler in the
basement with three rads on ground floor and 2 on first floor.
Heating works fine as does the hot water. If the heating is turned of
completely, but I have the hot water turned on, the rads can get VERY
hot, especially if I have the hot water turned up to 5 for running a
bath etc. Bolier has been in for about 2.5 years , pressure is fine.

Not being familiar with this particular boiler, I'm not sure whether it's a
combi - or whether you have a stored hot water system (hot cylinder in the
airing cupboard). We need to know which it is - because the diagnosis is
quite different, depending on the answer.
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Cheers,
Roger
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its a combi

fancyabrew wrote:

its a combi

So, when you turn on the hot tap the boiler fires up, but the water
comes out of the tap cold and the rads get hot instead... does that
sound about right?

If so the diversion valve inside the combi has probably failed.

--
Cheers,

John.

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\================================================= ================/

Nope, hot water works fine, BUT when the hot water circuit is on the
rads also get hot even if the heating circuit is turned off. I noticed
this over the weekend when I had the hot water switched on to run a
bath for the misses. We have a very high flow rate as we're at sea
level so I always switch the ho****er control to 5 to make sure the
waters good and hot. The heating was switched off at the time as the
house wasn't cold, but after a while I noticed the room getting a
little warm and when I touched the rad it was bleddy hot as were all
the rads in the house!

fancyabrew wrote:

Nope, hot water works fine, BUT when the hot water circuit is on the
rads also get hot even if the heating circuit is turned off. I noticed

OK, I am having difficulty resolving your "hot water circuit" and the
bit about having a combi boiler (i.e. one that heats hot water on
demand) and also talk about high flow rates seems out of place (given
the power of the boiler mentioned).

this over the weekend when I had the hot water switched on to run a
bath for the misses. We have a very high flow rate as we're at sea
level so I always switch the ho****er control to 5 to make sure the
waters good and hot. The heating was switched off at the time as the
house wasn't cold, but after a while I noticed the room getting a
little warm and when I touched the rad it was bleddy hot as were all
the rads in the house!

Could you confirm if you have a hot water cylinder in the house?



--
Cheers,

John.

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| Internode Ltd - http://www.internode.co.uk |
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| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

You could try Worcester technical helpline, or send an email enquiry -
www.worcester-bosch.co.uk will give you the number or the email address
(sorry can't remember tech helpline off the top of me head)

Thorn

John Rumm wrote:
fancyabrew wrote:

its a combi

So, when you turn on the hot tap the boiler fires up, but the water
comes out of the tap cold and the rads get hot instead... does that
sound about right?

If so the diversion valve inside the combi has probably failed.

We had the same problem in a Heatslave combi a few months ago. The
diverter valve gets a lot of exercise in a combi, especially if you're
in the habit of using frequent short bursts of hot water (eg to rinse
individual pots and pans). When ours was in the process of wearing out,
it went through a period of making little thoughtful noises, and finally
stuck part-way with exactly the same symptoms that the OP describes.


--
Ian White

that sounds about right. Rough cost to get fixed?

fancyabrew wrote:

(presumably about the diverter valve)

that sounds about right. Rough cost to get fixed?

The boiler repair got swept up into the bill for a much larger plumbing
installation, and only seems to have cost about £45 + VAT! As a one-off
job, you'd obviously have to pay a lot more.


--
Ian White

we've got a couple of plumbers here at work and they seem to think its
a stuck valve, expect a bill of up to £200 I've been told. Oh well
call to worcester comming up

"fancyabrew" wrote in message
oups.com...

we've got a couple of plumbers here at work and they seem to think its
a stuck valve, expect a bill of up to £200 I've been told. Oh well
call to worcester comming up

Have a look and see if the 3-way valve is easily replaced. If it can be,
then it may be worth it to do it yourself.

In an earlier contribution to this discussion,
Doctor Drivel wrote:

"fancyabrew" wrote in message
oups.com...

we've got a couple of plumbers here at work and they seem to think its
a stuck valve, expect a bill of up to £200 I've been told. Oh well
call to worcester comming up

Have a look and see if the 3-way valve is easily replaced. If it can
be, then it may be worth it to do it yourself.

So just where inside your one of beloved *combis* are you going to find a
3-way valve?
--
Cheers,
Roger
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