On Thu, 27 Nov 2003 20:53:38 +0000, rober wrote:
"Ed Sirett" wrote in message news
On Thu, 27 Nov 2003 17:49:43 +0000, rober wrote:
Hi,
I have a Saunier Duval Thelia 23, the central heating is working fine,
however the hot water is not.
When in Central Heating & Hot Water mode, the HW is almost
at mains temp, slightly above, when in HW only it is the same.
The HW temp control has no effect at all.
However putting it into HW mode and putting the CH temp
control to halfway, (usually is at 1/4)you get HW bouncing between
cold and hot and very hot radiators. The HW temp control has no
effect in any mode. Using it in the unorthadox CH burning hot it
makes a banging noise upon providing HW then gets cold then
repeats.
Any ideas on how I can fix this, don't want to run the gambit of
£50 call out fee's, getting a £300 repair bill and all. After installing
a doubleglazed window for about 10% of the cost 3 quotes wanted
i'm not in the mood for calling the professionals
As a pro I would be looking to check out the temperature sensors.
Likely they are NTC Thermistors perhaps they are both on the blink?
I suspect that if you turned the CH any higher you would get an overheat
lockout.
If you really need the installation and servicing manual.
Thanks for the help, found the part as DHW THERMISTOR 23&23E
Item Code : 57042, now just to work out where to buy it. I have found i'ts
location on the online pdf manual. Once I get it, how hard is it likely to be
to fit, i'm going for the option of replacing it for £20 as it seems likely
to be at fault.
The CH one is also suspect from your description and may even be an
identical component.
The manual will likely tell you how to do it. On many models the component
is screwed into the pipe which means you will have to depressurize and
drain the pipe(s) to change the sensors.
I would check the component before shelling out (given they are fairly
expensive on this model). A typical resistance would be 10k cold and much less
hot. The manual may indicate the value.
--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at
www.diyfaq.org.uk
Gas fitting FAQ
http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ
http://www.makewrite.demon.co.uk/SealedCH.html