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My P43 is burning hot, room temp is 72 stove is set at 65. It was working fine now this is happening, stove is only a couple of months old and not even a ton burnt in it yet. I am burning Turmans pellets..
It's hanging where the stove installer put it.. Coiled behind the stove on the rear side.. It was holding temp exactly what it was set for 70 at the probe and 70 in middle of room.
Try running it in stove temp for a day or two and see if holds temperature. I'd relocate the room temp sensor to a spot about 5' up from the floor and at least a few feet away from the stove itself.
Is the stove shutting off when it hits the 75, or is it staying on and just going to a low burn? If it goes to a low burn then either the room probe connection isn't tight or the probe itself is bad. If it is shutting off at 75*, I've got no idea why it would do that. One should think that the inside probe should be fine if you've only had it a couple months - but it never hurts to try cleaning it to rule it out.