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Old 03-23-2019, 08:47 PM   #1
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Furnace not igniting on 3011DS

We own a 2018 3011Ds and the furnace has worked fine until we unwinterized and headed south a few days ago. Of course, the first thing I checked were the fuses under the bed and by the door. Everything is OK but I replaced the fuse under the bed to be sure. Took the doors off the heater inside and out and can hear it trying to ignite but it won't catch. The blower comes on and is blowing cold air. It doesn't appear to have wasp nests that I can see anyway. Blew it out with canned air and cleaned everything off. Propane is working fine for fridge and stove. Either the furnace is not getting propane or it is just not igniting. Could there be a fuse somewhere I am missing? Any ideas why it won't ignite? Hate to have to pay someone to tell me it was just a fuse somewhere else.
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Old 03-23-2019, 09:11 PM   #2
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We own a 2018 3011Ds and the furnace has worked fine until we unwinterized and headed south a few days ago. Of course, the first thing I checked were the fuses under the bed and by the door. Everything is OK but I replaced the fuse under the bed to be sure. Took the doors off the heater inside and out and can hear it trying to ignite but it won't catch. The blower comes on and is blowing cold air. It doesn't appear to have wasp nests that I can see anyway. Blew it out with canned air and cleaned everything off. Propane is working fine for fridge and stove. Either the furnace is not getting propane or it is just not igniting. Could there be a fuse somewhere I am missing? Any ideas why it won't ignite? Hate to have to pay someone to tell me it was just a fuse somewhere else.
I had the same symptoms last week. I was out of propane. Swapped tanks and all was well.
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Old 03-23-2019, 09:17 PM   #3
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I had the same symptoms last week. I was out of propane. Swapped tanks and all was well.
But his stove and Frig run fine on the propane side.
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Old 03-23-2019, 09:18 PM   #4
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But his stove and Frig run fine on the propane side.
Yep....
Missed that.
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Old 03-23-2019, 09:26 PM   #5
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Do you hear the spark igniter clicking when it tries to ignite ?

What do think Dan...possible sail switch failure ?
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Old 03-23-2019, 09:38 PM   #6
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Do you hear the spark igniter clicking when it tries to ignite ?

What do think Dan...possible sail switch failure ?
I wouldn’t think so since he says he “can hear it trying to ignite but it won't catch.” I’m not sure what he’d be hearing if the sail switch is bad.
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Old 03-23-2019, 09:48 PM   #7
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The stove and reefer don't use the volume of propane that the heater does. When my tank won't run the heater I can still run the stove for a couple minutes.
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Old 03-24-2019, 08:10 AM   #8
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It sounds to me like you need to reset the regulator flow limiting device. You probably turned on your propane tank/s too quickly which can cause the regulator flow limiting device to activate which wil reduce the flow of propane from the regulator after the tank/s. In most cases, when this happens, you will get enough flow of propane for your refrigerator and your stove, but your stove burners will probably be a little smaller than usual, but you may not recognize this. You definitely won’t have enough flow of propane for your furnace, so you will hear the igniter clicking and you will be able to smell a slight odor of propane coming from the exhaust of the furnace on the outside of the camper.

Reset the flow limiting device by turning off the propane tank/s and disconnecting the propane lines from the tanks. Wait a few seconds, then reconnect the propane lines to the tank/s and turn on the tanks very slowly. Everything should be back to normal and you should now have sufficient flow of propane for the furnace to light.

I hope this is the problem and gets you warm.

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Old 03-24-2019, 11:06 AM   #9
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I’ve had this happen twice, (this is a built in tank on a mh). The low flow safety is built in the regulator you can tell if you light more than one stove burner and the second one will be only barely be on. The first time I changed the regulator but the second time I was able to thaw it with hot water.
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Old 03-24-2019, 06:39 PM   #10
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Correct!

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I wouldn’t think so since he says he “can hear it trying to ignite but it won't catch.” I’m not sure what he’d be hearing if the sail switch is bad.
Correct! It won't try to ignite if the blowers aren't up to speed causing the sail switch to remain open. It won't open the gas valve and it won't fire the spark.

(Everyone calls out the sail switch because it's the only part they understand.)

There are several possibilities, all named in the Suburban manual in the site library. Just follow the troubleshooting flow chart in this manual.

Interestingly, the first thing they tell you to check--and the most likely cause in trailers more than a few years old--isn't even in the furnace. It's the propane regulator, out in the weather between the two tanks. The water heater and range will operate across a wide range of pressures (the range has a secondary regulator so it won't even appear different), but the Suburban furnace is finicky.

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