Like many of you from the Northern areas, we love the fireplace. It is enough to take the chill off in the mornings when we have shore power. We left it on the other day set for 71°F and it was 80+ when we got back from getting groceries. I thought dang, we have one of those with the bad thermostat, I'll call GD and get a replacement ordered.
The person at GD asked us to pull the fireplace and get the serial number on the back so he could open a case with the vendor. So, I removed it from the slide out cabinet below the TV. Pull up on the bezel and there are 4 screws, easy. Fireplace is just 10 inches deep and has nice handle indents on the sides so I put it on the floor and left it running. I left it there for the next hour while we did other things. I was sitting quietly in my wonderful recliner reading phone junk... and the fireplace goes "click". I think, crap, it works! Sure enough, 72°F on the thermostat on the wall.
Now, you have to understand our family. We are all engineers and/or farm people. It is our job to understand how things work. Wife starts in with a flashlight on that fireplace now in the middle of the living space. There is the temperature sensor at the top of the unit, right where the air draws into the box. Now, look at the cabinet where it was removed. Completely sealed, panels on every side and top except for 2 holes drilled into the floor for some wires, and a funny triangle cut out that runs the length of the slide-out to deliver the wires to the microwave, refrigerator, outlets, etc. The coldest part of the dang camper.
The air for the intake is not from the room, it is the cold air from the cabinets in the kitchen slide! That air never warms up to turn off the fireplace thermostat.
New project: cut holes in the walls of the "box" where the fireplace is mounted into the side cupboards, and one into the space where the drawer is above. Cover holes with maybe a floor vent, chicken wire or anything so stuff does not fall into that area. Now the air will come in from around the doors (loads of space there, look for yourself) and from the drawer (some space there). Plug up that triangle wire race with some pink insulation and stuff the holes in the floor where the wires enter.

Never a dull moment in RV Land!
The person at GD asked us to pull the fireplace and get the serial number on the back so he could open a case with the vendor. So, I removed it from the slide out cabinet below the TV. Pull up on the bezel and there are 4 screws, easy. Fireplace is just 10 inches deep and has nice handle indents on the sides so I put it on the floor and left it running. I left it there for the next hour while we did other things. I was sitting quietly in my wonderful recliner reading phone junk... and the fireplace goes "click". I think, crap, it works! Sure enough, 72°F on the thermostat on the wall.
Now, you have to understand our family. We are all engineers and/or farm people. It is our job to understand how things work. Wife starts in with a flashlight on that fireplace now in the middle of the living space. There is the temperature sensor at the top of the unit, right where the air draws into the box. Now, look at the cabinet where it was removed. Completely sealed, panels on every side and top except for 2 holes drilled into the floor for some wires, and a funny triangle cut out that runs the length of the slide-out to deliver the wires to the microwave, refrigerator, outlets, etc. The coldest part of the dang camper.
The air for the intake is not from the room, it is the cold air from the cabinets in the kitchen slide! That air never warms up to turn off the fireplace thermostat.
New project: cut holes in the walls of the "box" where the fireplace is mounted into the side cupboards, and one into the space where the drawer is above. Cover holes with maybe a floor vent, chicken wire or anything so stuff does not fall into that area. Now the air will come in from around the doors (loads of space there, look for yourself) and from the drawer (some space there). Plug up that triangle wire race with some pink insulation and stuff the holes in the floor where the wires enter.

Never a dull moment in RV Land!