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Old 04-30-2012, 12:39 PM   #1
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Carrier gas burner fan turn off and on few times before shut off for good


I have a very old carrier gas furnace, don't know model#. Recently it has been acting very annoying, everything works properly i think, but when it riches set temperature then burner stops and fan stops shortly after but, fan immediately turning right back on for about 5-10 seconds, it does that twice before it shut off for good. I have changed fan limited switch or (high temp limit) # HH12ZA260A and vent safety switch # HH11AZ180, both did not solve the problem. Can anyone give me some advice on this, i am afraid it will get worse if i don't fix it soon.

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Old 04-30-2012, 01:04 PM   #2
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Carrier gas burner fan turn off and on few times before shut off for good


Like those on other DIY sites have suggested , a year & model would help.
Better still would be a photo of your furnace with the doors removed.

I am assuming your furnace is too old to have a flashing diagnostic led light that might be visable through a viewing port? Do you have an electrical meter to measure if those switches you changed are triggering the additional blower runs. Are your main fan controls part of a boards timer controls or do you have a separate bymetal fan/limit control?

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Old 04-30-2012, 01:39 PM   #3
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Carrier gas burner fan turn off and on few times before shut off for good


The model# is M58gs100-ca
150
Series# is 0589A03279

I don't see any LED light, and i don't have a separate bymetal fan/limit control. The fan has been acting this way before i changed those switches.

Tried to upload photos but failed.

Last edited by jspdr; 04-30-2012 at 01:49 PM.
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Old 04-30-2012, 02:18 PM   #4
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Carrier gas burner fan turn off and on few times before shut off for good


There are a lot of reasons why a furnace fan might short cycle.
Any momentaty break in the limit circuit/ faulting board dip switch/ board fan relay/ faulty thermostat or stat wires.
The Thermostat is the cheapest thing to eliminate.
Turn off furnace power, remove the thermostat wires from furnace at R & W and move them where they can't short anything out, put a jumper connecting R to W on the furnace where the stat wires used to be, turn the power back on to heat up the furnace. The furnace will fire up until you remove that jumper. If the furnace fan doesn't short cycle at the end of the heating cycle, then the problem is in your thermostat circuit.
If it does continue to short cycle, return everything the way you found it....It's being caused by something else.
Let us know what happens and keep trying on that photo.

Last edited by how; 04-30-2012 at 02:43 PM.
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Old 04-30-2012, 02:39 PM   #5
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Carrier gas burner fan turn off and on few times before shut off for good


I replaced new Honeywell digital t-stat 6 months ago. I'll try to do that tonight. Photos still failing, but looks very similar to the attached link

http://www.askmehelpdesk.com/attachm...-800-x-600.jpg

Last edited by jspdr; 04-30-2012 at 02:44 PM.
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Old 04-30-2012, 05:22 PM   #6
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Carrier gas burner fan turn off and on few times before shut off for good


definitly residual heat off the heat-X after the stat satisfies check that OFF setting sounds too low at least 80F OFF
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Old 04-30-2012, 06:19 PM   #7
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Carrier gas burner fan turn off and on few times before shut off for good


If that is the case, then what do i need to do to reduce the heat residual to correct the problem?
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Old 04-30-2012, 07:29 PM   #8
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Carrier gas burner fan turn off and on few times before shut off for good


This is why I asked you if you had seperate temp. controled fan/limit controls or timer controls. Bymetal controls can work themselves out of adjustment and cause short cycling whereas timer controls are not sensitive to temp differences and generally don't ever need recalibration.
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Old 04-30-2012, 10:10 PM   #9
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Carrier gas burner fan turn off and on few times before shut off for good


Finally i can post the photos of my furnace. One of the photo is the switch i replaced. I don't see a bymetal control anywhere. I did removed the t-stat and connected a jumper between r & w, the heat turned on, when i removed the jumper the fan motor is still short cycling.
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Carrier gas burner fan turn off and on few times before shut off for good-resize.jpg   Carrier gas burner fan turn off and on few times before shut off for good-resize2.jpg   Carrier gas burner fan turn off and on few times before shut off for good-resize3.jpg  
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Old 04-30-2012, 10:14 PM   #10
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Carrier gas burner fan turn off and on few times before shut off for good


I not so sure I like the way the pictured furnace is burning.....

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