Faulty CM707 Thermostat?

Soldato
Joined
22 Jul 2014
Posts
3,928
Location
Oxon
Hi,

We've got a Honeywell CM707 fitted in our flat, about 3 years old, but since the recent warm weather, the temperature that it shows is way higher than it actually is. It's currently saying 25 C when it's obviously no where near that. It's not a problem now but as soon as it starts getting colder again it'll be an issue.

If it's faulty, I might as well replace with a smart thermostat that can be controlled by wifi - does anyone have any recommendations? Is the wiring identical?
 
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