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Had a new central heating system installed, a closed system with a large separate hot water unit. I tried to be smart and had a nest thermostat fitted in order to manage everything but it simply isn't working! there are times of day when the heating is on full, usually in the middle of the night, but it is never on in the morning as the programme says, slao if you turn the heating off then it effects the hot water.
any suggestions?
Do you have it on eco 'smart' mode? if so it ignores the manual programme and tries to learn your routine and demands and you might get some strangeness while it's learning.
I've recently installed 2 Nest thermostats..one for my main CH system and one for my underfloor heating in the extension.
The former I have on a manual schedule while we're working form home but will turn it onto auto as soon as we return to work. Seems to be behaving itself in manual mode.
The underfloor heating we have on learning and it works fine and has learned our routine pretty quickly.
ON affecting your hot water...this is odd. the two things are separate so I can't envisage why the CH side should affect hot water. Are you sure it is connected properly?
The installation is pretty simple but the hardest thing I found was understanding your system and did require some re-jigging of existing wires to accept the Nest even though my installation is a pretty basic one.
Are you saying the Nest wall control is stating the heating is off, but the boiler is running?
If so, its either wired up wrong, or another stat or timer (on the boiler?) is calling for heat. The timer on our boiler is set to alway on so the Nest has full control.
If the Nest wall control is calling for heat but you didn't set it that way its probably remembered a time when you did ask for heat, or its preheating as it knows it takes an hour to get your house to 18 degrees for 6am in the morning.
Heating off turns off the hot water? Might be a stuck motorised valve but I'm on shaky ground here as I've only had an instant boiler for the last few years.
turn off the learning function.
I had a Nest thermostat fitted at the end of last year and experienced similar problems as you and it drove me bonkers!!! However, after I turned off the ECO mode (learning), the Nest thermostat has very worked well ever since.
will turn off the learning function and see how it pans out!
Installer mixing up the heating and hot water wires would be my guess.
Open the Nest app, select Hot Water, and tap "Boost". If your heating comes on then that's the problem...
Eco mode on a Nest is different to the learning function. Eco mode just makes it colder in the house.
We’re just renovating a 4 bed house and thinking of NEST, now thinking it might not be the right idea or Is this just an isolated case? Would want no heating at night and in the winter to come on at 5 and off at 8 . At the moment we have a wireless control and just put it up from 15 when it gets a bit cold....this learning function sounds like it could be expensive while it “learns”
On the whole my Nest thermostat is a bit of a disappointment. I tried to give it time to learn my routine but it struggled (and I live alone in a 1-bed flat and have a fairly set routine) and I ended up switching that off but still left the bit active where it works out how long it to takes to get up to temperature so if you say set it as 7am and 22c it will come on when it needs to to reach that temp for 7am. However I've now even turned this off - dunno what it's playing at but I noticed a couple of times I'd get up like 1 or 2am and notice the house is warm and already at the temp I'd set it for later. So no I've changed my schedules to manually take into account how long it takes the house to heat up.
The only benefit I now have from my Nest is if I notice it's chilly/too warm I can just speak to it (via Alexa) and adjust the temperature - not exactly a huge selling point though.
I've found the learning to be quite quick on the one I've got it set up on. It requires you to regularly interact with the thermostat...keep tweaking it...the more you alter it the more data it has to better work out what it needs to be doing. But unless you're going to use the smart features of the stat then its just an expensive dumb stat.
Clearly it helps if it is installed correctly in the first place so that is where I'd start with the OP's problem. The CH and HW sides are completely separate, one should not be influencing the other.
But unless you’re going to use the smart features of the stat then its just an expensive dumb stat.
we didn't use the learning feature, our system never had a stat installed we primarily use it as set to come on/off at set temps and that we can switch on off via phone app.
dumb? maybe but its a convience thing for us
There is also a feature on the Nest that means your Hot Water has to be on above 70c for two hours one a week
As our water only goes for 30 minutes at a time, this was firing in our house. I discovered when it fired it would be in the night at 2am ish. Annoying
when that's going there's another icon on the screen https://support.google.com/googlenest/answer/9256656?hl=en
you can turn it off.
And obviously turn off Eco mode. It doesn't work yet.