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Old 12-06-2017, 02:28 PM   #1
2016 FR3 28DS
 
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Furnace keeps shutting off

We own a FR3 2016 with a Suburban thermostat. We are now experiencing temps dropping into the low 40's. (Due to Hurricane Harvey we are forced to live in the RV until the house is back in living condition) I have read the manual that is online and it doesn't help me. I turn the thermostat to auto, setting it at 74 degrees, making sure that I am showing heat on the control panel and then I press furnace. It stays on for about 40 minutes and then shuts off and won't go back on! Am I missing a step? Thanks for any suggestions you can offer!
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Old 12-06-2017, 11:37 PM   #2
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My furnace is doing the same thing. If I reset the breaker(turn off then on again)it will start back up again and run until it reaches the set temp then shuts off and doesn't come back on again.
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Old 12-06-2017, 11:49 PM   #3
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When you say it doesn't come back on - does it blow any air at all ? or just not hot air?
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Old 12-07-2017, 08:06 AM   #4
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I don't want to hijack the OP's thread but for me nothing comes on again.
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Old 12-07-2017, 10:00 AM   #5
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I believe that there is a way to reset the thermostat by removing power to it for about 10 seconds. If you use the search feature at the top of the forum page, you will find there are many threads in the forums about the same problem.
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Old 12-07-2017, 10:18 AM   #6
2016 FR3 28DS
 
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The furnace turns completely off and will not come back on, even when temps in the RV are very chilly! It does not blow any air hot or cold once it shuts down.
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Old 12-07-2017, 11:17 AM   #7
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Quote:
Originally Posted by GabbyM View Post
The furnace turns completely off and will not come back on, even when temps in the RV are very chilly! It does not blow any air hot or cold once it shuts down.
If you have the standard analog suburban t-stats like this one, you might want to replace it with a digital.


I had a similar problem on my Roo 19. Furnace would light off once, then never again unless T-stat turned off.

I replaced it with a Honeywell RTH-111B and never had another issue.
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Old 12-07-2017, 11:40 AM   #8
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Quote:
Originally Posted by GabbyM View Post
We own a FR3 2016 with a Suburban thermostat. We are now experiencing temps dropping into the low 40's. (Due to Hurricane Harvey we are forced to live in the RV until the house is back in living condition) I have read the manual that is online and it doesn't help me. I turn the thermostat to auto, setting it at 74 degrees, making sure that I am showing heat on the control panel and then I press furnace. It stays on for about 40 minutes and then shuts off and won't go back on! Am I missing a step? Thanks for any suggestions you can offer!
Could you post a photo of this Suburban thermostat with an auto setting or a model number? (NOTE: I've seen digital 'stats for Suburban tankless water heaters but not furnaces)

All the Suburban furnace 'stats I've seen are analog and have no auto setting.
Typically if it's a digital stat with auto, it is a Dometic and used in conjunction with the A/C. Sometimes those 'stats need re-initialized.
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Old 12-07-2017, 02:27 PM   #9
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It sounds like your furnace is going into Lockout. There are several conditions that can cause this. Download the service manual and follow the instructions for trouble shooting this problem. (Try Bryantrv.com for your manual.)
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Old 12-07-2017, 04:12 PM   #10
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Here's a manual that covers a lot of models.
Attached Files
File Type: pdf Suburban Furnace Service Manual.pdf (4.92 MB, 443 views)
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