Nest Progammer switching heating on when it shouldn’t.

[Fredmercer]

• My boiler switches on heating water when I have not programmed it to do anything.. we suddenly notice the boiler light on and hot water going through the pipes although the programmer says nothing is on. We have noticed it some 10 times over a six week period. However we don't know how many other times it may be happening that we didnt notice. Any ideas what is wrong? We had it installed in April 2020.

[Johnty · Accepted solution]

Probably the anti bacterial (legionaires) option on.  Took me a while to suss it.  Google search it.

[Fredmercer]

Absolutely correct Johnty. Thank you very much for helping me. It was very frustrating not knowing why my boiler was apparently switching itself on. I am very grateful. Thanks, Fred

[Jhonleanmel]

Hi everyone,

@Johnty, thanks for the help.

@Fredmercer, I hope you've got the answer you're looking for. If you're still in need of any assistance, feel free to let us know.

Best,
Mel

[Princesss]

Hi there,

Chiming in to see if you still need assistance with this. Hope the previous post helped. Let us know if you have additional questions, otherwise we’ll be locking the thread.
 

Best,

Princess

[Princesss]

Hi there,

Due to inactivity, I'll go ahead and lock this thread in 24 hours. Feel free to start a new thread if you need assistance with your Nest Thermostat and we'd be glad to assist you further.
 

Best,

Princess