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Out of the frying pan into the fire.... (Own goal)

AncientMariner
For some years have had Siemens wireless thermostats. The central heating being in 3 zones. Upstairs, downstairs and conservatory. The conservatory being a non-programmable RDH10RF. The house a 1950s three bedroom detached with garage at the side, with an extension behind the garage and the conservatory behind the extension. With a bit of effort you can locate on Google Earth.  The C/H boiler is adjacent to the rear of the garage.  A couple of years ago, the conservatory thermostat would often loose communication to its receiver located in the garage on the rear wall.  Went through the obvious of checking the thermostat battery, OK. Taking the thermostat into the garage where it worked.  Since it had worked ok, out it down to it going iffy and replaced it.  Soon the same problem again.  Now, there is a combined 3G/4G O2 Vodafone mast about 250 metres away, and I know that our house is located slap bang in one of the hot areas - Vodafone kindly sent me a field strength chart. Then realised that the plasterboard wall of the extension - which is between line of site from the thermostat has a foil lining.


Yesterday, fitted a nice new piece of 3187Y through the wall and relocated the receiver.  Job done, I thought. Wrong. It's even worse now!


The only two users of around 433 MHz, the frequency of the wireless link, at any decent field strength that I was aware of were the radio amateur 70 cm band and a certain RAF radar station in North Yorkshire whose transmission is centred on 435 MHz.  There are no obvious signs, ie a 70 cm aerial in the neighbourhood and we are a fair distance from North Yorkshire.  So the question is, why does my PC and/or two displays radiate on 433 MHz. Drat........

At least I now know how to resolve it on a cold night.

Clive



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    My Evohome wireless stats were not consistent in communicating with their respective receivers. It was a real pain, wakening up on cold mornings and no heat. Tried absolutely everything but no luck. Evohome suggested moving the three receivers 600mm apart. There was no manufacturer instruction as to their installation with respect to each other so I had them fairly close to each other. Moving them made a mess of my original nice neat set up but it did solve the problem. No issues for a couple of years now.
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    Locally people were claiming to have issues with their Worcester Bosch wireless thermostats because they clashed with transmissions from the police HQ mast.


    I have been told that actually there's a surprising number of separate signals coming from the mast making difficult to identify which transmitter is causing the problem. 


    Andy B
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    I have exactly the same Siemens wireless thermostat and it has only lost contact when it needed new batteries, otherwise it has behaved itself. 


    Andy B
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    I forgot to mention that the two programmable thermostats, also Siemens on 433 MHz are fine, even though one has to communicate across the house and the other one has a direct parth of about 3 metres diagonally through a brick wall to the other side. 


    Ancient Mariner's Captain would not be too happy if I now suggested another location!

    Clive
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    Have you tried moving the receiver? Add a length of 5 core cable, possibly run externally around the garage and back in somewhere

    Edit; just saw Lyle's post, missed it first read.
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    I do not trust anything wireless to be completely reliable as the wireless thermostats only produce a tiny power output. A good old fashioned wired thermostat is much better. Don't be lazy, run some cable lads.


    Z.
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    I have been told that actually there's a surprising number of separate signals coming from the mast making difficult to identify which transmitter is causing the problem. 



     





     


    It is possible that one of the transmitters is defective, and a spectrum analyser (a machine with a scannin receiver and the ability to plot RF level aainst frequency) will reveal that,  It is also possible that they are all working within their licence conditions, and the problem is that of using an unlicences allocation or inadaquate receiver immunity.

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