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You are at too high an elevation for the burner to ignite properly.
(move to lower altitude)
If none of the above fixes the problem, there may be another failure in
the furnace. (have furnace checked by trained RV Technician)
If the furnace does ignite, there may still be problems at higher
elevations.
As the altitude increases, the air is thinner and has less oxygen. This
causes the flame to burn ―rich‖ (not enough oxygen to burn the all of
the propane
(LP)
).
A ―rich‖ burning flame will create more soot. This may show up as
a blackened exhaust area on the side of the trailer.
Excess soot may foul the igniter. (the furnace must be removed from
the trailer to clean the igniter.)
Running the furnace at lower altitudes will help to burn off some
accumulated soot and may help to keep the igniter cleaner and
prevent fouling of the igniter.
If the igniter is fouled, the furnace will not ignite even at lower
altitudes, until the igniter has been cleaned.
- If the furnace will be used almost exclusively at higher altitudes,
smaller orifices may be ordered from Suburban furnace and installed by
a trained RV Technician to adjust the air/fuel mixture to make it more
―lean‖.
- If you put in a ―lean‖ orifice, the furnace may not ignite or burn
properly at lower altitudes.
- There will be an altitude where even a ―lean‖ orifice and the Altitude
Compensator set to HIGH will cease to function. This altitude is
unknown and has not been tested and will vary from trailer to trailer.
