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Old 01-09-2014, 07:35 PM   #11
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Yes, the blower goes on for about 30 secs. then shuts off. No heat during that time.
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Old 01-09-2014, 09:03 PM   #12
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you should hear it sparking at the same time
tick, tick, tick, tick, tick, then stop and then start again.
until the furnace fires
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Old 01-09-2014, 09:28 PM   #13
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So I understand. No such thing happens. Do I have a fuse problem? I've checked the fuses in the house and battery compartment, but I haven't checked those in the "power distribution center". Maybe that's next? Also, I can't find a sail switch. Maybe someone with this furnace (Suburban SF-35F) could help me locate it.
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Old 01-09-2014, 10:03 PM   #14
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Are you sure your not in lock-out mode on your furnace. It will try 3 times and if no flame, then go into the lock-out. Try turning your furnace to the off position, then try again.
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Old 01-09-2014, 10:48 PM   #15
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How do I do that? You mean a switch on the furnace itself? I saw a video of such a switch on utube, but I haven't seen it on my furnace. I'll look. Thanks.
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Old 01-09-2014, 10:59 PM   #16
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On your thermostat.
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Old 01-10-2014, 12:05 AM   #17
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Oh yes, I've done that. Many times. Still no clicking sound. I'm going to look for a fuse problem tomorrow. Too late tonight. Thanks.
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Old 01-10-2014, 05:35 AM   #18
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Here is service manual for your unit if you don't have it already.
Attached Files
File Type: pdf Suburman Furnace_Service_Manual.pdf (4.92 MB, 89 views)
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Old 01-10-2014, 07:28 AM   #19
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You say the furnace fan will run for 30 seconds then stop.
You don't hear the tic tic tic of the spark.
This sounds to me like the sail switch is not closing.
That's a switch that's blown shut by the force of the blower.
The sail switch must close before the gas valve will open.
I'm not sure if the sail switch must close before the igniter sparks
but I want to say it should close first.
If the blower comes on but the sail switch does not close, nothing else
will happen.

You're getting pretty close to needing to pull out the furnace for further
testing.
This isn't typically that hard to do but if you're not electrically inclined it
might be time to call a repair man.
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Old 01-10-2014, 04:23 PM   #20
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Yep. I'm beginning to see the picture. The repairman will be here tomorrow morning. Thanks to all for your help.
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