Thank you so much for your post, I really appreciate it but sadly it was installer advanced programming that I was using as I had already seen the post above and had followed it but to no avail.
I have also found the following manual for it online and it also doesn't mention Option 40 so I was...
I was hoping someone can tell me how to change the thermostat so we can programme six events per day instead of four? I have tried installer advanced programming but there isn't an option 40 when I scroll through. I would be very grateful for any ideas. I believe it's an old thermostat from...