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Old 02-23-2008, 03:05 PM   #1
EAB
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Location: Glendale, Az
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Hi all. A while back I posted that my heater quit and it turned out to be a bad high limit switch.
Problem with heater, shuts off after 30 secs
Well, since then I've gone through about 4 of those things. They are cheap and easy to change, but waking up in the middle of the night because you are frozen tends to upset the wife. Is there any common reason that these things go out? I was thinking about putting something between the switch and its bracket to slightly insulate it, because it may be getting a little too hot at some point and tripping?
Once a new one is installed, it lasts for 6-9 months, so its not like its immediatly tripping. Any advise appreciated
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Old 02-23-2008, 03:05 PM   #2
EAB
Junior Member
 
Join Date: Dec 2003
Location: Glendale, Az
Posts: 24
Hi all. A while back I posted that my heater quit and it turned out to be a bad high limit switch.
Problem with heater, shuts off after 30 secs
Well, since then I've gone through about 4 of those things. They are cheap and easy to change, but waking up in the middle of the night because you are frozen tends to upset the wife. Is there any common reason that these things go out? I was thinking about putting something between the switch and its bracket to slightly insulate it, because it may be getting a little too hot at some point and tripping?
Once a new one is installed, it lasts for 6-9 months, so its not like its immediatly tripping. Any advise appreciated
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Old 02-23-2008, 09:37 PM   #3
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Have you cleaned the ductwork and fan cage? Is the sail-switch operating easily? Is the burner operating with the proper flame adjustment?
Those are a few questions that pop up since you said the limit switch is fine for month at a time.
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Old 02-25-2008, 07:29 PM   #4
EAB
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On top of the heater it says 'max vent temp 200*'. So if I measure at the closest vent, will this tell me anything, or is this for some other test for a heater tech?

How do you adjust the flame? Is it adjustable?
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Old 02-27-2008, 05:48 PM   #5
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It's time to hire a RV technician to properly set LPG pressure to your furnace and properly adjust the flame size. I think the "200*" is for heated air exiting the heat exchanger. Flame size should be set after insuring proper gas pressure.
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Old 03-02-2008, 07:02 PM   #6
EAB
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So is there an adjustable LP regulator on the unit? I'll check it out tomorrow, wish me luck...
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