Originally Posted by krowsea
It was a memorable experience, and I wanted to 'share'.
There are some experiences that you may not want to share.
It is wise to remove the furnace every 5 or 6 years, to clean it internally as well as to check the gaskets.
The combustion chamber does inhale dirt etc, and even a cup full of dirt is more than enough to alter the performance of the furnace.
There are gaskets between the fan and combustion chamber. There is also a gasket between the burner log and the combustion chamber. That gasket in particular, depending on hours of use, fails after a period of time.
When the burner log gasket fails, carbon monoxide will enter the trailer.
It is best to not assume the condition of any furnace that has been in service for a while.
It is far better, to remove it and have it cleaned along with replacing the gaskets.
Some dealers simply try to blow out the dirt with an air hose. It cannot and does not do the job, period.
The combustion chamber is "S" shaped. The burner log must be removed. Then the dirt and foreign materials can only be removed by tilting the furnace sideways a number of times, which moves the dirt through the "S" chambers, and finally out through the hole that held the burner log.
Always be safe with LPG appliances, especially in an RV. Strange things happen.
An LPG explosion can be deadly.