Possibly connected to an "app" update.

Woke up this morning to a cold house. My Smart thermostat was offline.

After an hour of faffing, I finally re-paired it to the app (It's a Zigbee
wireless gateway, for the record - Thanks https://www.youtube.com/watch?
v=QAEtp-7QBQU )

Anyway, now it seems to think it's 24C in the room, which it most
certainly is not. And by that I mean it *really* thinks it's 24C, so I
have to set the thermostat to 26 to get the boiler to fire.

So unless there are some minute life forms living on the sensor,
something is amiss.

I can't see how it can be app-related. But then why else would this
happen ?

On Sat, 26 Nov 2022 14:54:45 +0000, Jethro_uk wrote:

> Possibly connected to an "app" update.
>
> Woke up this morning to a cold house. My Smart thermostat was offline.
>
> After an hour of faffing, I finally re-paired it to the app (It's a
> Zigbee wireless gateway, for the record - Thanks
> https://www.youtube.com/watch? v=QAEtp-7QBQU )
>
> Anyway, now it seems to think it's 24C in the room, which it most
> certainly is not. And by that I mean it *really* thinks it's 24C, so I
> have to set the thermostat to 26 to get the boiler to fire.
>
> So unless there are some minute life forms living on the sensor,
> something is amiss.
>
> I can't see how it can be app-related. But then why else would this
> happen ?

Aha ! To answer my own problem, there is an offset

https://fil-tec.ru/uploads/docs/moes-bht-002-wifi.pdf

On 26/11/2022 14:54, Jethro_uk wrote:
> Possibly connected to an "app" update.
>
> Woke up this morning to a cold house. My Smart thermostat was offline.
>
> After an hour of faffing, I finally re-paired it to the app (It's a Zigbee
> wireless gateway, for the record - Thanks https://www.youtube.com/watch?
> v=QAEtp-7QBQU )
>
> Anyway, now it seems to think it's 24C in the room, which it most
> certainly is not. And by that I mean it *really* thinks it's 24C, so I
> have to set the thermostat to 26 to get the boiler to fire.
>
> So unless there are some minute life forms living on the sensor,
> something is amiss.
>
> I can't see how it can be app-related. But then why else would this
> happen ?

If you have had the thermostat in your hand you may/will have warmed up
the case. When I program my wireless thermostat I have to wait approx 10
minutes before it reads the room ambient again.

Also many "smart" thermostats have a temperature error/correction
adjustment. Often used to adjust for the thermostat being placed in a
position where it doesn't accurately measure the mean room temperature.
Have you inadvertently set this offset adjustment too, say, 4C?
--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On Sat, 26 Nov 2022 16:05:22 +0000, alan_m wrote:

> On 26/11/2022 14:54, Jethro_uk wrote:
>> Possibly connected to an "app" update.
>>
>> Woke up this morning to a cold house. My Smart thermostat was offline.
>>
>> After an hour of faffing, I finally re-paired it to the app (It's a
>> Zigbee wireless gateway, for the record - Thanks
>> https://www.youtube.com/watch? v=QAEtp-7QBQU )
>>
>> Anyway, now it seems to think it's 24C in the room, which it most
>> certainly is not. And by that I mean it *really* thinks it's 24C, so I
>> have to set the thermostat to 26 to get the boiler to fire.
>>
>> So unless there are some minute life forms living on the sensor,
>> something is amiss.
>>
>> I can't see how it can be app-related. But then why else would this
>> happen ?
>
>
> If you have had the thermostat in your hand you may/will have warmed up
> the case. When I program my wireless thermostat I have to wait approx 10
> minutes before it reads the room ambient again.
>
> Also many "smart" thermostats have a temperature error/correction
> adjustment. Often used to adjust for the thermostat being placed in a
> position where it doesn't accurately measure the mean room temperature.
> Have you inadvertently set this offset adjustment too, say, 4C?

Yes (red face)

On 26/11/2022 15:54, Jethro_uk wrote:
> On Sat, 26 Nov 2022 14:54:45 +0000, Jethro_uk wrote:
>
>> Possibly connected to an "app" update.
>>
>> Woke up this morning to a cold house. My Smart thermostat was offline.
>>
>> After an hour of faffing, I finally re-paired it to the app (It's a
>> Zigbee wireless gateway, for the record - Thanks
>> https://www.youtube.com/watch? v=QAEtp-7QBQU )
>>
>> Anyway, now it seems to think it's 24C in the room, which it most
>> certainly is not. And by that I mean it *really* thinks it's 24C, so I
>> have to set the thermostat to 26 to get the boiler to fire.
>>
>> So unless there are some minute life forms living on the sensor,
>> something is amiss.
>>
>> I can't see how it can be app-related. But then why else would this
>> happen ?
>
> Aha ! To answer my own problem, there is an offset
>
> https://fil-tec.ru/uploads/docs/moes-bht-002-wifi.pdf

Handy, probably been hacked by the Russians as a new tool for energy
disruption in Europe!

--
Cheers,

John.

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

John Rumm <see.my.signature@nowhere.null> wrote:
> Handy, probably been hacked by the Russians as a new tool for energy
> disruption in Europe!

The nice thing about this particular thermostat is you can reflash it with
firmware that's entirely local and doesn't talk to the mothership in China:
https://github.com/klausahrenberg/WThermostatBeca

(although that may require the wifi version of the thermostat - not sure if
the Zigbee one is compatible)

I would expect also that local-only firmware wouldn't randomly fail if the
mothership is down, and at most would require a power cycle to get working
again.

Theo