Originally Posted by Cooki
I have a 2018 Wildwood T27TD55 and the furnace changes the temperature that I set it for, air conditioning will come on for no reason. We are having cooler weather so I have the furnace set at 24 C the fan set at Auto and the cool set at 18C . One time the temp changed to 90 c A couple times the air conditioning comes on. When I check the setting they have changed to strange settings. Example heat to 4 c. Any information will be appreciated thanks
Can't explain the thermostat changing itself off the top of my head, but I think there is a potential problem with your settings. If the furnace is trying to maintain 24 C and the air conditioner 18 C it could be trying to call for both at the same time when the temp is between 19 and 23 C, the air conditioner trying to cool it down to 18 and the furnace trying to warm it up to 24. I'm not sure what that would do. Below 18 it should only be calling for heat and above 24 it should only be calling for cooling, but in what most would consider the "comfort zone" it would try to do both. I'm guessing since there is only one thermostat whichever responds first is what runs, but it is just that, a guess. But it could explain the AC coming on randomly if the AC activated first.
Usually the air conditioning temperature is set higher than the furnace temperature, say AC to 25 C and furnace to 22 C. Above 25 the AC kicks on and below 22 the furnace kicks on. From 22-25 neither are called for.