rv furnace

mccoydetlef wrote:
hooked to shore power.This is rear furance front furance works great right next to it

Oh ok, I would look at the sail switch first. They stick as well as go bad. I would first try tapping it as you are trying to fire it up, that worked for me once. The other time it happened it was the board, I just swapped the board because I always carry a spare board.
Things happen to me when im in the middle of nowhere. :)

I know there are 'youtube' repair/testing videos that will show you how to test or change it.

hooked to shore power.This is rear furance front furance works great right next to it

mccoydetlef wrote:
OK started up furance blower came on but no heat.DSI IS THE SAIL SWITCH OR BOARD GONE BAD how do i ck

low battery ? plug in MH to shore power.

Turn on the stove burner and then fire up the water heater. If the burner flame goes low when the WH fires up, you have a pressure regulator LP problem.

Sail switches can be held open by a very small piece of dust or other debris.
It can in most get cleaned using a can of compressed air.
If you have a compressor with long (12 inch) blower can be used.
This is something you should due a couple tyimes of the year depending on your enviroment!

My Montana High Country 5er's furnace has always acted a bit funky since we got it a year ago. Especially if running out of propane (since I keep one tank shut off all the time and fill the empty one immediately as possible.) Or, if turning on the furnace the first time after not running for a while, the results are the same. The blower comes on, and it attempts to fire two times. The third attempt at firing and it starts.

Before tearing things apart trying to figure it out, check to make sure the furnace is getting the propane, lines are bled out of air. Here again, simplest solution is to lite the stove (If it's gas).

Otherwise, just keep repeating attempting to turn the furnace on. Between each failure, turn the furnace off at the thermostat, wait about 30 seconds and then flip it back on. If after the third attempt it fails again, repeat. It might take a few times of this to get the air out of the gas line. If you have done this already multiple times already, then something else is going on. Someone else will need to chime in.