Can someone help me with my heating control please?

[Wonderingwhyme]

I have the Honeywell cm927 control on the wall and it’s been fine the last few years. However last night and one night last week the heating has been coming on despite it not meaning to. It has 6 ‘times’ it can come on so I have it:
1 530am 21 degrees
2 730 20
3 3pm 21
4 630pm 30
5 630pm 20
6 630 18

So number 5 and 6 are because you have to set a time and I don’t want it coming on after 630pm and this has worked fine. It came on last night at 2am!!! It wakes me up when it comes on so it needs to stop but I don’t know why it came on. Yes it was very cold last night but I came down and thermostat said it was 19 degrees so it shouldn’t come on!!

Can anyone help me stop it coming on at night? Of course I’m not going to turn it off by the switch at 630om as that means it won’t come on by itself in the morning.

Appreciate anyone who knows what they are talking about if they can help!

Oh bless number 4 should be 20 degrees not 30!!!

Balls not bless!

Just have the last 3 one minute apart, you might be confusing it. But check the clock and the date are correct.

I was going to say that 30 degrees was a bit high 😂

Has it just come on because the temperature has dropped below the set heat? Over night mine is set to 14 so it doesn't come on unless it is really really cold. (It's a different controller though)

As previous poster said, try changing the last setting to a lower level and see what happens. I have a few indoor thermometers and sometimes they show 14c when it's been cold overnight.

14c might be a good option to start with, as if it falls below 14c, it's going to be really cold - we had the pipe to our bedroom radiator free when we had the beast from the east and my parents once had a bedroom radiator on a north wall freeze resulting in it bursting, so good to not let it drop too low.

We have this controller, it's working fine with the time scale. It has a feature where you can set a 'frost guard' where the boiler will come on if it gets below a certain temperature - the default is 5 degrees - our boiler came on last night in the middle of the night. I think the sensor picks up the outside temperature as it obviously wasn't 5 degrees in the house.

Set the temperature lower for the time you don't want it on.

Ok I’ve changed the last time and temperature. It was cold last night definitely but not enough for the heating to come on! Yes it has the frost guard thing and I’m sure it’s also 5 degrees on this too.