Wiser Hub not telling Boiler to fire when radiators calling for heat

[csaunders72]

Hello,

We installed our Wiser system about 1 year ago with 5 smart TRVs. About 3 months ago we switched all our other radiators to smart TRVs. Apart a few glitches it was working well.

Recently, however, we are experiencing a growing number of issues more and more often. Of particular concern at the moment is that the boiler is often not fired up even when many radiators are calling for heat.

A curious incident happened on Friday 10th in the morning when all radiators were warming up nicely but then they all started cooling down even though they hadn't reached target temperature. I've uploaded logs from the Hub so, hopefully, you can see that.

It is worth noting that one reason I had Wiser installed is that I am disabled, with very limited mobility, so I can't turn radiators on or off manually or check what the boiler is doing. My condition also means I am very sensitive to cold so I need a reliable and controllable heating system.

I hope someone can help in this matter.

Cheers,

Colin

[PhilHornby]

Schneider/Drayton support are not currently frequenting this forum - it's just other users like yourself.

You could raise a fault at: https://schneider-electric.zendesk.com/hc/en-gb/requests/new 

or

https://www.draytoncontrols.co.uk/contact-us (Not sure what the difference is, but it also has a phone no. to call).

The effect you're seeing might just be normal operation (for example, in "ECO" mode, devices are turned off before the end of scheduled times).

IMHO, if you need room temperatures to be anything like accurate, you need Roomstats, rather than just relying on iTRVS. The latter are affected by the heat of the radiator and compensation has to be applied - they're in what is probably the worst location in the room for performing this function.

[csaunders72]

Thanks for your response.

Having re-read my post I now realise it was not totally clear what I was trying to describe. I'll try again ...

I'm aware of having to set the iTRVs to a higher temperature than what we want the room temperature to be. As you said, being right next to the radiator is bound to affect the performance. And thanks for the link to their support desk - I couldn't find that the other day.

The iTRVs were, on the whole, calling for heat and getting the rooms up to temperature set on the app. So all was good ... until Friday this week. I did wonder if it had gone into some ECO mode but the app doesn't show that. 

So since Friday, it's been behaving strangely. It's probably worth mentioning that on Thursday we had some glitches on our house electricity supply. Caused lights to flicker but my computer monitors didn't turn off.

Here are some screenshots from the App showing the behaviour of the iTRV in my home office.

Friday:

• Starts warming up fine in the morning
• About 7:30, before reaching target, the temperature starts going down
• Note - most of the iTRVs did the same thing at that time
• We tried various things - reboot Hub, boost all, turn off hot water, just turn on this one iTRV etc etc
• And eventually it warms up again in the afternoon

 

Saturday:

• Similar drop off in the morning at 6:30
• And again in the middle of the day
• Again, tried a few things - reboot hub, take batteries out/in of some iTRVs to rejoin system, etc etc 
• Then, later on, it behaves properly

Sunday:

• Today it's in a good mood 🙂

 

Has anyone experienced this kind of behaviour?

Could the power glitches have damaged or confused the Hub?

Any responses much appreciated.

Cheers

Colin

[Ch0ngma]

How did you extract logs from the Hub? I've experienced this a few of times over the last year, the most recent being a couple of weeks ago and just thought that it was more an issue with my install. Mine seems to fail in the afternoon, but the next morning everything is back to normal. (Also causes a problem with Insights as it thinks you've been burning extra fuel).

Additionally a few days last October, the boiler was staying on even though there was no request for heating / hot water...

[csaunders72]

Hi,

Oh, the bit about the logs was referring to the function in the app to upload them. I presume that's to a Schneider/Drayton server somewhere.

Update: The system has continued to stop providing heat every so often with no obvious pattern as to when it happens. Our plumber came out to have a look but, obviously, it was all working fine when he was here. He said the boiler could be shutting down if an airlock made it to the boiler but he didn't think there was much air in the heating circuit. We have found that we can usually get the system going again by putting it in Away Mode for 15 minutes or so and when we cancel that it wakes up. If that doesn't work then power-cycling the Hub usually does.

It all seems to suggest it is the Hub playing up. When heating or hot water go live I can hear a click from the Hub which suggests it has relays to control those circuits. Could they have been damaged by the power supply glitches we had last week?

Cheers,