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Heater only blowing cold air


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Went camping this past weekend (Nov 4-6) at Shaver Lake, CA. Temps were 20 to 46 degrees throughout our stay. The last night, the heater would only blow cool air. We just bundled up for the night.

Turns out we had plenty of propane; everything else was working. I searched the Ollie sight the next day (found something once) where someone had the same problem. I took off the exterior heater panel and checked connections; all secure. I blew into the compartment with my own breath and force and a very small amount of dust came out (hull 1019 is less than a year old) Turned on the furnace again, and it worked! What's up with that?

Dave & Terri Mazone

2022 LII Hull #1019

TV: 2001 Chevy Silverado 2500 HD diesel, Crew Cab (4WD)

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Based on what I have seen on this forum, you may have had some type of a bug that left a web in the area where the flame starts heating the furnace. 

I had the same problem you had a year ago and installed a screen over the furnace outlet, which I saw was recommended on this forum.

I have not had a problem since.

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5 hours ago, Dave Mazone said:

I blew into the compartment with my own breath and force and a very small amount of dust came out (hull 1019 is less than a year old) Turned on the furnace again, and it worked! What's up with that?

A small can of compressed air is your friend.  Just do not use that can and direct the air back into the propane jet.  Dusty roads are not your friend as aren't bugs.  Obviously it only takes a very small amount of dust to "gum up the works".

Bill

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It's also conceivable that the sail switch was being impeded and your messing around in the compartment got just enough dust off of its mechanism that it was able to switch when the air flow started (the sail switch involves a flap - i.e. "sail" - that sits in the flow of cabin air that rushes through the furnace when it's running, and my understanding is that it's meant to ensure that the flame won't go on unless there's sufficient flow through the furnace to keep that flame's heat from building up too high w/in the furnace due to low air flow. BUT the switch is prone to not working properly when it gets gunked up with sufficient amounts of dust or pet hair or such. 

My guess is that it's more likely what dewdev described, though, unless you blow into the area where the fan is that moves the air from the return into the ducts, which is where the switch sits.

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Jim and  Yanna, Woodinville WA

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12 hours ago, dewdev said:

Based on what I have seen on this forum, you may have had some type of a bug that left a web in the area where the flame starts heating the furnace. 

I had the same problem you had a year ago and installed a screen over the furnace outlet, which I saw was recommended on this forum.

I have not had a problem since.

Hi Jim,

It was something, but mighty small if so. I had the bug screen installed before I left Hohenwald. I think it was a tiny bit of dust. ???

Dave & Terri Mazone

2022 LII Hull #1019

TV: 2001 Chevy Silverado 2500 HD diesel, Crew Cab (4WD)

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9 hours ago, topgun2 said:

A small can of compressed air is your friend.  Just do not use that can and direct the air back into the propane jet.  Dusty roads are not your friend as aren't bugs.  Obviously it only takes a very small amount of dust to "gum up the works".

Bill

Where is the propane jet? I wasn't able to see anything (but I don't know what I'm looking for either)?

Dave & Terri Mazone

2022 LII Hull #1019

TV: 2001 Chevy Silverado 2500 HD diesel, Crew Cab (4WD)

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