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Old 10-10-2015, 11:15 AM   #1
Sailrguy
 
Join Date: May 2015
Location: London Ontario
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Suburban furnace wont ignite

Hi group
Suburban furnace acting up.
Can hear the fan start, can hear the gas valve open, can hear the igniter clicking, smell the gas at outside exhaust and hear the gas valve close.
Does 3 times , purges air and shuts down.
Light gas stove to ensure good gas supply and try again.
Same result after 4-5 tries.
Can't access from outside so it is on the floor operation.
Could the igniter be "clicking" without a spark?
Any thoughts before I start pulling the unit out?
Thanks
Sailrguy
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Old 10-10-2015, 05:32 PM   #2
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You have checked almost everything that I can think of to try.
One last thing, it is a long shot, but worth a try. If your battery is a bit low your gas valve may not be opening properly to produce a sufficient gas flow. Try plugging into shore power then try the furnace.
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Old 10-10-2015, 09:41 PM   #3
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I would try to see the spark. Might be out of adjustment. If you smell gas it should light unless a blockage in airflow. Night or dark would be the best to see it.


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Old 10-11-2015, 09:55 AM   #4
Sailrguy
 
Join Date: May 2015
Location: London Ontario
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Ideas appreciated

Will check battery levels tomorrow and also spark. I know batteries are down a bit as they have not been charged for a month or so and have been activated on and off since last charge.
I know there's draw even tho' main switch is off while in storage.
Will put a genny on it tomorrow before any other action.
Thanks again for the help
Sailrguy
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Old 10-11-2015, 01:06 PM   #5
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we had same problem so while at The Rally the Suburban guys came and checked it out. they pulled the unit out and took it apart and found one piece of Styrofoam bubble in the fan. he said that would do it, or pet hair on the fan will keep fan switch from working properly. So look for that kind of stuff inside fan housing.
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Old 10-11-2015, 03:56 PM   #6
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I am pretty sure the sail switch is working properly because the gas valve and igniter are operating, maybe not properly, but they are working. If the sail switch did not close then nothing else would energize.
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Old 10-11-2015, 09:13 PM   #7
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Have you checked the venturi tube for spiders or other obstructions? I've even seen mud daubers build in them.
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Old 10-12-2015, 10:17 AM   #8
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Sail switch was sticking on my SF 35. Tapping the furnace would fix temporary and then stick again. If you replace the sail switch, replace the limit switch while you have it apart. Both switches are pretty inexpensive.
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Old 10-12-2015, 02:54 PM   #9
Sailrguy
 
Join Date: May 2015
Location: London Ontario
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In appreciation

Thanks for the ideas and theories folks.
All considered and will use for analysis.
Not looking forward to the chore, ( situated under the stove) but has to be dealt with as we are leaving Oct 19th for AZ
Will advise the outcome.
Thanks
Sailrguy
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Old 10-12-2015, 03:50 PM   #10
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Hope it is an easy fix.
Have a good drive and stay safe.
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