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9pm water heating

Community Member

I have a nest that controls both heating and hot water from a condensing boiler.


It seems to randomly be turning on the hot water at 9pm despite the schedule not calling for it to be on. As far as the nest is concerned the hot water is off but the boiler is fired up, the pump working and the valve set to water.


I tested the system by turning on the heating when the system was running and the valve moved into the middle position and not the heating hence my conclusion that it must be a bug in the nest telling the system to come on.


Manually turning the hot water on and off does not resolve the issue, the only way is to cut the power and leave it over night. The following day the schedule works fine and it may not turn the hot water on at 9pm.


On days when it comes on at 9pm the schedule works fine and the hot water tuns off in the evening as planned. It then comes back on at 9pm and always 9pm, it would appear to continue all night if the power isn't cut


The scedule calls for 3 sessions each an hour long.


Any thoughts?


Community Specialist
Community Specialist

Hi there @Kucat,


Thanks for letting me know and thanks for the detailed explanation. That's very helpful. Could you tell me please if you go into Settings > Equipment > Continue > Bacteria Prevention in the actual thermostat, what option do you see highlighted in there? 

Community Specialist
Community Specialist

Hi, I wanted to check in. DId you get the chance to try out what my colleague suggested? Keep us posted.

Community Specialist
Community Specialist

Hey there, I haven't heard from you in a while so I'll be locking this thread. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community. Thanks, AlexD.