My thermostat has suddenly stopped controlling the hot water according to the schedule. I am able to boost on & off just fine but for some reason the hit water is not coming on at scheduled times so we often have cold water in the morning - not ideal! Any suggestions?
It's a new installation with a system boiler and unvented cylinder.
Still having this issue BUT (thanks to my plumber) it has now been pointed out to me that it is possibly a LEGIONELLA BACTERIA prevention. There is an option in the thermostat to enable/disable the facility to HEAT the water to ensure that it prevents the bacteria growth. Sooooo, this kicks-in if the water temp has been too low for 48 hours or so. I checked & my thermostat is set to enable this facility. Hey presto, this is why it sometimes randomly heat up !!!! I don't know on earth Google didn't flag this up as a possibility ??? I am DELIGHTED & RELIEVED after 10 months of tearing my hair out. Please all check this out.
My water heating was working all fine until last week when I set the thermostat to eco before going on holiday for 4 days. On return the water does not heat up. Boost does not work either. I reset the thermostat to factory settings a few times but this still has not resolved the issue. I then saw your post and tried to enable/disable the bacteria prevention setting but it still does not work 😞
Is there any other suggestion please?
After many calls with nest customer service when hot water schedule was working but heating schedule not.. with manual working for both it turns out that the way I scheduled heating was wrong… it now works… in summary on hot water schedule make sure you put in a start temperature then leave gap and put in stop temperature that is lower .. I put in 20.5 degrees start and then a second bubble later saying 17 degrees .. this sorted my problem and now both schedules work .. I made the mistake of putting in hourly heat bubble kn schedule at same temp ..thinking this was needed .. sorted!
I’ve the exact same issue - last two days the hot water hasn’t come on, boiler not firing up even tho it is scheduled & I’ve not changed any settings. Boost works ok & heating is ok.
I hope Google sorts this out ASAP as no hot water in winter isn’t good !
There is a setting on the Nest thermostat - enable schedule was off for some reason. I didn’t touch it so must have been an automatic update. Now it works fine 🤨. Can’t believe it really - good luck
Thanks for this... I've had the same problem over the last week or so... Hot water scheduled but not coming on, boost working fine. I've just checked and sure enough, enable schedule was off on the nest thermostat. I'd also not changed it. Just set ienabled schedule to on on the thermostat and now my hot water has come on according to my set schedule. So pleased.
Same with me also. Frustratingly for the past 3 months, my hot water stops working exactly every 48 hours. I can always 'boost' BUT have to open the thermostat manually before it re-sets itself, only then lasting another 2 days before it knocks itself off again. It's very strange. To be honest, I've never had 100% service since the thermostat was installed in August 2021. These issues seam to come & go & thought I had it fixed when I had 'enabled' the legionella setting & the hot water settings........ I'm tearing my hair out why these problems arise from nowhere & Google/Nest support is non-existent.
I am pulling my hair out too! I overlooked the 48hrs - it sounds about right now that you mention it. Could it possibly be something to do with home/away mode which kicks in after 48hrs? I'll let you know if I get anywhere....
My problem was that I didn't have a hot water schedule at all. I called a company called HANDA HEATING LTD 07929 080000 and someone talked me through the problem and resolved it. The problem was that my boiler was down as a combi boiler and I had to change it to just a system boiler. You may want to give them a call, there was no charge!
As per my earlier response, Try calling HANDA HEATING LTD, 07929 080000. They talked me through how to resolve my problem...I had my boiler listed as a combi boiler and it isn't! They didn't charge either.
In the lack of a response from the community and from the developer via Play Store, I started messing around with settings on the Thermostat on the off chance and believe it or not found a setting that turns the hot water schedule on and off, which I didn't recognise and can only presume had been added in an update? Somehow this had been set to off so I set it to on and now the schedule works fine. What a stupid thing but also simple to resolve, thankfully. Good luck all