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RV ovens are notorius for being inaccurate. I'm assuming you have a good oven thermometer to measure the actual heat.
The heat sensor is kind of fragile and must be positioned properly. When you replaced the themostat, hopefully it came with a new heat sensor. If not, you may need to replace it. If it did, make sure the heat sensor is in the proper position in the retaining clip.
Could the knob be on wrong, where it shows warm but is actually in the 450 degree range. I realize it's difficult to put the knob on wrong due to design, but I have seen it happen.
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"Small House, Big Yard "
"May the FOREST be with you" Alfa See-Ya 5'er and 2007 Kodiak C4500 Monroe
From my repair experiance most all oven themostats and the sensors are one combined unit, unless it is lit with a hot surface igniter. If it is the later then there is an oven safety valve in the gas line, usually at the inlet to the burner. I have found that sometimes that valve will stick open allowing gas to flow constantly to the oven burner causing no temp. control for the oven. If it is not electronic ignition then you may have gotten a control that is DOA, in which case should still be under warranty.
Be extremely careful with the sensing bulb capillary for it is very fragile. No kinking or extemely sharp bends.
When you purchased and installed the new thermostat was the sensing capillary tube and sensor attached to the thermostat? If it was and you were very careful with that sensing capillary tube and sensor and your still having no temperature regulation then it's a DOA.
That sensing capillary tube w/sensing bulb contains a small chemical charge that increases pressure as the temperature rises expanding a small bellows that closes off the gas flow, as the oven cools the pressure on the bellows decreases to a point that again allows gas flow.
