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Old 11-28-2011, 11:27 PM   #1
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Quatro SV9500


What does the "burner limit circuit open" means? Where can we find equipment manual?

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Old 11-28-2011, 11:32 PM   #2
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Quatro SV9500


High temperature limit switch located in the burner compartment. Also may mean roll out switch. Same difference outside of location in furnace which will tell a tech what to look for and where.

No manual needed. Two eyes, a few basic hand tools such as wire strippers, some wire nuts and a brain will suffice.

It's not hard. Give me a second and I'll post a pic of what to look for.

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Old 11-28-2011, 11:39 PM   #3
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Quatro SV9500






Some are resettable.
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Old 11-28-2011, 11:41 PM   #4
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Quatro SV9500


The red button in the middle is the reset button. Not all have reset buttons.

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Old 11-28-2011, 11:46 PM   #5
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Quatro SV9500


Limit swtiches are normally closed meaning they normally allow electricity through them. When they trip, they open and that electricity not making it back to the board sets of an alarm, cutting off all calls via the stat and telling the blower there is excessive heat in the furnace and to get rid of it.

This is why your blower is the only thing working on heat (or cool). It'd be nice of you had a digital meter so you can check continuity through each switch to tell if it was open or closed. Thre will be more than one switch. Pretty much you're going to look for a limit switch, one of as pictured, in the burner area. There will be two wires to each switch, one feeding and one bringing elctricity back.

You got a meter?
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