We're cold. All devices show NO SIGNAL

[IceHouse]

Not sure where to go with this.

All devices are showing as NO SIGNAL this morning, and the house is cold.

I've tried power cycling the Hub (which is active in the app, and shows strong connection to internet).

[PhilHornby]

(I'm assuming a Boiler controller HubR)

The "NO SIGNAL" will pertain to the 2.4GHz Zigbee signal between Hub and the iTRV's/Roomstats. If it's saying the same for all of them, it points to the problem being with the Hub itself.

Has any new potential source of interference been introduced into the house?

Has anything been put in front of the Hub that could block its signal (my other-half has a large metal vase, she uses for this purpose 🙄)

Press and hold the "Heating" button on the hub and it should energise the motorised valve(s) and in turn the boiler. Refit your old TRV heads, or simple remove any iTRVs.

If all else fails, you could try a master-reset of the Hub and re-pair all the peripherals.

[IceHouse]

Thanks for trying to help - as you can imagine we are pretty worried.

Yes, HubR, 2 room thermostats, 4 iTRV, 1 UFH.

No, there's been nothing introduced that would cause interference, nothing changed overnight.

All the devices came back online within an hour of my post, so we had heat for an hour or so.

However all the devices dropped again.
This time I popped the batteries in one of the Room Thermostat, I waited for it to complete its reboot, at which point all the other devices cascaded back online.

This does suggest a problem with the HubR, though maybe not with interferences as the cause?

[PhilHornby]

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@IceHouse wrote:

This time I popped the batteries in one of the Room Thermostat, I waited for it to complete its reboot, at which point all the other devices cascaded back online.

This does suggest a problem with the HubR, though maybe not with interferences as the cause?

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I wonder if that Roomstat could be the source of the problem? Maybe even something like a stuck-down button, causing it to continuously transmit and jam up the airwaves. (I don't how resilient Zigbee is to that sort of problem).

Or, could the whole system be extremely marginal in terms of zigbee signal? Before I bought my Repeater, I had some iTRVs that would drop off the system occasionally - but would 'work OK' the rest of the time.

[IceHouse]

Today, to try and get to the bottom of this, and now another (possibly related) issue, I've installed Home Assistant with the Wiser integration on a spare Raspberry Pi, and the Zigbee network map shows 'Very good' or 'Medium' signal between each node, not marginal.

I'm not sure that a stuck button on a stat is a possibility - they aren't physical buttons.

[PhilHornby]

Could something have changed on your 2.4GHz Wi-fi configuration - such that it's now interfering with the Zigbee network? 

https://www.crownhill.co.uk/zigbee-and-wi-fi.html 

The Zigbee channel in use is only available via the API ☹️

[IceHouse]

Nothing changed in our network, though scanning the neighbourhood channel 11 looks to be congested.

Our network was sitting on Channel 6, I've moved this lower, and provided the HubR with its own dedicated SSID.

Without knowing where exactly the wiser Zigbee is sitting, I'm not sure whether these observations will be significant.

Next step seems to be to get a Zigbee sniffer to see what's going on in our vicinity, though this maybe just to confirm that the Wiser system is not resilient enough for the job being asked of it.

[SAtewart]

i saw in another thread that a recent hub upgrade hadn't executed properly and the MAC address was wrong at the hub end. Schneider support people sorted it

[IceHouse]

Thanks for the tip, but I'm not sure how to go about getting any help from support - my email about this subject is yet to receive an answer 3 days later, and a much simpler request has yet to be resolved 4 weeks later (ie. a stat is faulty, please replace).

To say I'm unimpressed with Drayton (Schneider Electric) Support is an understatement 🙂