Originally Posted by Silver Threads
Was wondering if anyone else has had the problem of keeping there heater pilot light lit? We can light the furnace and it will heat up the trailer, then when it kicks off, the pilot light goes off to. My husband blew out the lines but it didnt help. It helped all the other appliances, but not the heater. Any ideas?
You have two problems.
1. More than likely, the LPG pressure has dropped, It should be between 11 and 13 inches of water column pressure, preferably 12.5 inches.
2. Periodically, the furnace must be remove and taken apart, to clean out the dirt and sand that it has sucked into the combustion chamber. The combustion chamber is very small. When you reduce it's volume, however slight, then the furnace will light and run just fine. BUT
when the furnace shuts down, it will "suck" the pilot light out. That is exactly how you have described the operation.
There is no short cut to correct the problem.
You cannot blow out the dirt with air.
The proper fix is;
1. Remove the furnace.
2. Remove the burner log from the combustion chamber. You will usually find it partially clogged up as well. You can clean the slots with a hack saw blade.
3. Tap the combustion chamber with a hammer. That will loosen other dirt and rust.
4. Since the combustion chamber is like a sideways "S" you must tilt the combustion chamber side to side, which allows the dirt and rust to move from one chamber to the next, and finally out through the hole where the burner log was located.
5. Dump the dirt out on some paper.
6. Have someone stand by you, to give you "smelling salts" when you faint when you see how much foreign material will fall out.
7. Check the gasket on the blower assembly as well as the gasket between the burner log and combustion chamber. If more than 10 years old or so, they will need replacement.
8. RV Furnaces should be removed and cleaned every 4 to 7 years, maximum, depending on the frequency of use and the area that it was used in.
9. You can almost bet your last dime, that if your furnace has been used and not taken apart and cleaned within the above time frame, that you will dump out at least one or two "cupfuls" of foreign material.
10. That reduces the cubic volume of the combustion chamber enough, so that the pilot light will be sucked out, everytime the furnace shuts down.
Again, trying to blow out the dirt with air will "NOT"
correct the problem. That could also cause some damage to the combustion chamber.
Many repairs can and do have short cuts.
This repair does not have a short cut.
Remember, no short cuts when dealing with an explosive material, such as LPG.
If you don't feel qualified to do the repair, take the trailer or furnace to a shop that you can trust. The qualifying test for that shop is have them tell you the proper way to clean a RV furnace. If they tell you anything other than the above, move on to another dealer.
Please post the results you find when you disassemble your furnace.
Others I am sure would like to also know what you found.