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  • FIRST POST
    • piccalilli82
    • By piccalilli82 16th Jul 17, 1:02 PM
    • 15Posts
    • 0Thanks
    piccalilli82
    Central heating control broken - replace with Nest?
    • #1
    • 16th Jul 17, 1:02 PM
    Central heating control broken - replace with Nest? 16th Jul 17 at 1:02 PM
    My block had a power cut for several hours the other day and when the power came back on my central heating control seemed completely dead.

    The boiler (Vaillant ecoTEC plus 831) and thermostat (Honeywell DT90E) seem fine and the hot water is working but the LCD display on the heating programmer (Danfoss TS715SI) is blank with no LED light. I've tried take it off the base to check if there was an obvious battery or fuse and re-mounting as well as resetting it but no joy. If I were to replace this unit like-for-like with another Danfoss can anyone tell me if that would be likely to solve my problem?

    Alternatively if I'm likely to need a professional to investigate I am considering getting a Nest (or equivalent) replacement rather than spending anything on an older system. The Honeywell thermostat on the wall in hallway is battery powered but it's been installed over a hole in the wall where there a couple of red cables. Is this likely to be somewhere a Nest could be easily connected to the mains?

    Any advice appreciated, thanks
Page 1
    • Doozergirl
    • By Doozergirl 16th Jul 17, 1:37 PM
    • 23,411 Posts
    • 65,460 Thanks
    Doozergirl
    • #2
    • 16th Jul 17, 1:37 PM
    • #2
    • 16th Jul 17, 1:37 PM
    The Nest is wireless.
    Everything that is supposed to be in heaven is already here on earth.
    • ossie
    • By ossie 16th Jul 17, 1:41 PM
    • 305 Posts
    • 292 Thanks
    ossie
    • #3
    • 16th Jul 17, 1:41 PM
    • #3
    • 16th Jul 17, 1:41 PM
    The Nest is wireless.
    Originally posted by Doozergirl
    Just like your Wi-Fi wireless router, Nest Thermostat needs to be wired for power, but it connects to the Internet wirelessly.
    • piccalilli82
    • By piccalilli82 16th Jul 17, 1:56 PM
    • 15 Posts
    • 0 Thanks
    piccalilli82
    • #4
    • 16th Jul 17, 1:56 PM
    • #4
    • 16th Jul 17, 1:56 PM
    Yes I understand that Nest communicates to the heat link wirelessly but it needs power by usb or the mains. I read some other forums on this but got a bit lost on what V supply it needs and whether the old cables behind my current thermostat could be easily connected to it/supply the correct power.
    • Alex1983
    • By Alex1983 16th Jul 17, 2:01 PM
    • 312 Posts
    • 165 Thanks
    Alex1983
    • #5
    • 16th Jul 17, 2:01 PM
    • #5
    • 16th Jul 17, 2:01 PM
    That's what lets the nest down, you'd be better off with a hive, the hive stat takes batteries.
    • I have spoken
    • By I have spoken 16th Jul 17, 2:52 PM
    • 4,817 Posts
    • 9,528 Thanks
    I have spoken
    • #6
    • 16th Jul 17, 2:52 PM
    • #6
    • 16th Jul 17, 2:52 PM
    Unless you want/need the remote control of the Nest with mobi app, I'd got for a Digistat+3 RF - https://www.heatingcontrolsonline.co.uk/acl-drayton-invensys-digistat-plus-three-wireless-programmable-thermostat-p-97.html

    The 7 day wireless programmable room thermostat will replace your thermostat and controller, plus wall unit is battery operated.
    Last edited by I have spoken; 16-07-2017 at 2:55 PM.
    • piccalilli82
    • By piccalilli82 16th Jul 17, 6:12 PM
    • 15 Posts
    • 0 Thanks
    piccalilli82
    • #7
    • 16th Jul 17, 6:12 PM
    • #7
    • 16th Jul 17, 6:12 PM
    Hmmm, I don't see the Nest saving me much money particularly but I do quite like the remote control and/or geofencing aspect as my schedule is quite erratic.

    I'm basically hoping there is a dead simple (and cheap!) solution to get my current set-up working again that I can do myself. If I need to get a tradesperson in I think I will go for a 'smart option'

    Does anyone have particular experience with Nest or Hive? A few reviews i read seemed to suggest Nest had the edge (plus Hive has that awful advert song!) but I'm open to suggestions.

    What would you expect to pay for installation of a smart thermostat? (in London). I figure I should get a boiler service at the same time. Would a general heating engineer be able to cover this or do you need to get specialist 'smart' installers in?
    • ladymarmalade222
    • By ladymarmalade222 16th Jul 17, 6:34 PM
    • 605 Posts
    • 552 Thanks
    ladymarmalade222
    • #8
    • 16th Jul 17, 6:34 PM
    • #8
    • 16th Jul 17, 6:34 PM
    I love my Nest and would not be without it.

    I do not have a regular routine lifestyle so love that it switches off when I move away from home. I have also reduced my bills a lot as I can switch it on via my phone for 15 mins to warm up the lounge where as when I used to switch my heating on manually I found I left it on longer due to forgetting.

    If you do get a Nest it will take a couple of weeks to learn your lifestyle and you may also have to change a couple of settings. There is a warm up setting where it learns how long it takes to warm up to temperature eg in the morning but I found it was switching on a little too early. Also they have just added a function to avoid legionnaires disease so if your water is not heated for 2 hrs in a certain period it heats up to prevent it. I switched it off as it was coming on too much.

    The control on your phone is great though. If you are away you can put on your heating whilst on your way home or have hot water for a bath.

    I would not be without mine now and will always replace with a Nest.
    • I have spoken
    • By I have spoken 16th Jul 17, 6:40 PM
    • 4,817 Posts
    • 9,528 Thanks
    I have spoken
    • #9
    • 16th Jul 17, 6:40 PM
    • #9
    • 16th Jul 17, 6:40 PM
    Nest have a list of installers - https://nest.com/uk/nest-pro-installation/?from-footer=true
    • Gloomendoom
    • By Gloomendoom 16th Jul 17, 6:56 PM
    • 12,400 Posts
    • 16,574 Thanks
    Gloomendoom
    We have a Hive. I fitted it myself. I think it took around 20 minutes. The most involved part was drilling the holes in the wall to mount the thermostat.

    Like the Nest, it is boon if you have an irregular lifestyle.
    Advice; it rhymes with mice. Advise; it rhymes with wise.
    • TheCyclingProgrammer
    • By TheCyclingProgrammer 16th Jul 17, 7:44 PM
    • 2,574 Posts
    • 1,414 Thanks
    TheCyclingProgrammer
    Yes I understand that Nest communicates to the heat link wirelessly but it needs power by usb or the mains. I read some other forums on this but got a bit lost on what V supply it needs and whether the old cables behind my current thermostat could be easily connected to it/supply the correct power.
    Originally posted by piccalilli82
    The Nest thermostat can also be powered by a 12v supply from the heat link, which is how I've wired mine. No plug on show.
    • eastonian
    • By eastonian 17th Jul 17, 9:30 AM
    • 46 Posts
    • 16 Thanks
    eastonian
    Nest stat is powered via a standard micro USB port - much like most Android phones. I put a spur underneath the floorboards and chased ducting into the wall - we were decorating anyway so was just a little plastering job to hide the cable. Otherwise you'll need it near a socket, or the heat link, for power.

    I like mine, but it was 'free' with npower when we changed supplier, and our last stat had died so it made sense. Not sure I'd lay out for a new one, but maybe an older model on ebay would be a good deal? They auto update their software so the experience would be the same.
    • Chimpofdoom
    • By Chimpofdoom 18th Jul 17, 9:00 AM
    • 776 Posts
    • 327 Thanks
    Chimpofdoom
    I opted for Tado over nest, mainly over two things.

    Nest requires to be powered over USB/Plug and it doesn't (maybe didn't now) do geo-location, you can enable it by IFTTT. Like yourself I was replacing a wireless battery powered thermostat.

    So far Tado has paid for itself since August!
    To the internet.. I need to complain about something!
    • Le_Kirk
    • By Le_Kirk 18th Jul 17, 10:09 AM
    • 1,874 Posts
    • 938 Thanks
    Le_Kirk
    Just a thought that you ought to try to fix the original device before considering changing it to a Nest or similar. Have a look at this link for the manual and page 20. It's possible that the power outage and reinstatement has blown the fuse to the timer supply.
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