My furnace worked fine last Thanksgiving. Made a little trip this week and it got down into the 30's. Turned on the furnace and here is what happened:Blower turned on,I heard the burner ignite,ran for a little while,burner and blower stopped at the same time,few seconds later the blower came on,burner restarted,ran a little while and the cycle repeated,the amount of run time was not the same it varied from a few minutes to a few seconds,After a several cycles I waited for the burner and blower to stop and then switched the unit off at the thermostat. The blower then came on to cool the heat exchanger and then turned off.Any ideas?

One of the common things that I have found is the connection to the ignitor is corroded. It is good enough for it to ignite the gas but, not good enough to get the burn signal to the board. Try removing the connector from the ignitor and then reinstall it and wiggle it around a bit. If that doesn't fix it, pull the board and have it checked at an RV repair facility. Good Luck

use a wire brush and gently clean the area by the igniter and also any flakes of corrosion and then try to light it.

Forget fuel?:S Happened to me x many times.

If the burner and the blower motor are stopping at the same time, it appears you are loosing the 12 volts to the furnace. The blower motor should never stop during the burn cycle. Please post the model of your furnace so we can look at your specific wiring diagram and give you some more advice. Wiggle the wire connections at the furnace and see if you can duplicate this motor stopping problem during the initial start cycle.

Sounds like you are low on propane, or low pressure on your propane. The furnace is attempting to fire and will burn for a few seconds and then turns off. It will repeat a couple more times until it finally shuts down. Move the thermostat back and forth and it will attempt to kick on again. It may for a few seconds and then shut down. Every time that's happened to me, it's because my propane tank just ran out. But, low pressure because of a clogged regulator, could cause the furnace to do the same thing.I have found that the stove top burners will still make a flame when my furnace will not kick on because of low pressure or propane tank almost completely empty, but still enough "umph" the stove top will lite.

Furnace problem | Good Sam Community

jetcare
Explorer
Apr 28, 2017
If the burner and the blower motor are stopping at the same time, it appears you are loosing the 12 volts to the furnace. The blower motor should never stop during the burn cycle. Please post the model of your furnace so we can look at your specific wiring diagram and give you some more advice. Wiggle the wire connections at the furnace and see if you can duplicate this motor stopping problem during the initial start cycle.
janechucknicode
Explorer
Apr 28, 2017
Forget fuel?:S Happened to me x many times.
lj2654
Explorer
Apr 28, 2017
use a wire brush and gently clean the area by the igniter and also any flakes of corrosion and then try to light it.
wkamper
Explorer
Apr 28, 2017
One of the common things that I have found is the connection to the ignitor is corroded. It is good enough for it to ignite the gas but, not good enough to get the burn signal to the board. Try removing the connector from the ignitor and then reinstall it and wiggle it around a bit. If that doesn't fix it, pull the board and have it checked at an RV repair facility.
Good Luck

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