Vaillant Vsmart Batteries problem

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30 Aug 2019
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Hi.. i had my boiler fitted about 8 months ago along with vsmart thermostat and it worked fine until a month ago. My first set of batteries lasted a good few months but last month they lasted for about 15 days (energizers) and the set after that lasted about 10 days (phillips). Weirdly, heating comes on if i don't replace the batteries for a few hours and once came back from work to a boiling home (it was 28 degrees outside that day).
Does anyone else have this problem and any suggestions? How long are your batteries lasting?
 
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I'm not familiar with the Vsmart, but can you turn off the backlight? It will consume most from the battery if left permanently on.

Use Duracell batteries. I have found they last over two years in a Honeywell CM927.
 
I used to buy batteries from poundland lots of different brands all crap, only use Duracell
 
I have used energizers and they lasted well not sure why is it using them so much in last couple of months. And why is it causing the heating to come on when batteries are dead. All schedules are off and its not even turning on times that were in schedule when they are dead. Could it be the thermostat that has gone faulty?
 
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1. buy a pack of Duracell, Theres a very good reason there more expensive than other batterys.
2. get on the VSmart App and check the signal strength you have between reciver and unit in the settings, if its a poor signal then it will have to communicate back and forward much more to succesfully send and recieve signals using up batterys notably faster than they should.
3. The Vaillant controls are built so that if they fail the heating will revert to being on rather than off so your not left freezing in winter time, you can then turn heating down or off at the radiator thermostat setting on the boiler its self.

And as a note the VSmart uses a paper display so uses very little energy to power the screen as it only uses power to change the display not to maintain it.

After that if your still going through them, get your installer to arrange a Warranty visit from vaillant incase you have a faulty stat
 
Thank you very much guys for your comments. I got vaillant to replace it today as signals were good and thermostat has been sat at same place since i got it so will check how it goes. The guy said he hasn't had it before where batteries were going so fast.
 
and it worked fine until a month ago.
if its a poor signal then it will have to communicate back and forward much more to succesfully send and recieve signals using up batterys notably faster than they should.

Assuming that it is two way communication then the short battery life can also be caused by a newly installed wireless linked system in your or a neighbour's house keeping the receiver in the thermostat active when it should be in sleep mode.
 

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