gas furnace occasionally doesn't run as indicated by thermostat

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  #1  
Old 12-06-14, 05:52 AM
feh
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gas furnace occasionally doesn't run as indicated by thermostat

Hi folks.

I have a furnace that is not maintaining the house temperature as set by the thermostat. I replaced the thermostat to make sure that was not the problem.

What will happen is that the thermostat is set at some temp, the house temp will be below that, but the furnace is not running. This happens once every couple days to as often as 3 or 4 times a day. The frequency may be associated w/ the outside temp (colder=more often), but I can't guarantee that.

If I either turn the thermostat off for a few seconds and then back to heat, or if I turn the power off to the furnace for 10 seconds and then back on, the furnace fires up and heats properly.

My first thought was a tarnished thermocouple, but I cannot find it on this furnace. It is a Carrier that is about 20-22 years old, with an automatic pilot.

Any thoughts? Thanks!
 
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Old 12-06-14, 05:58 AM
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Any model number? Is your filter clean.
Geo
 
  #3  
Old 12-06-14, 06:54 AM
feh
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It's a weathermaker sx:
model: 58SXA080-GG
series: 100

Filters recently replaced.
 
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Old 12-06-14, 07:35 AM
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Hopefully someone will reply with a service manual,not sure that burner has the traditional type thermal couple,can you tell if the draft inducer motor is running? That has to be running before any other will happen, be sure the pipes for the exhaust outside aren't restricted.
Geo
 
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Old 12-06-14, 08:09 AM
feh
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When it's not working, the furnace is completely silent; not doing anything. I don't know at what point in the ignition process things are getting shut down, or if the process is even being started.
 
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Old 12-06-14, 08:22 AM
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Here are some links to manuals for your furnace:

http://dms.hvacpartners.com/docs/100.../58SXA-1SI.pdf
http://dms.hvacpartners.com/docs/100.../58D,S-2SM.pdf

Here is a link to a recent post by a member with a furnace in the same series:

http://www.doityourself.com/forum/ga...ite-pilot.html

Since you don't have a diagnostic light on the control board you will have to set the thermostat to heat and carefully watch the sequence of operation (page 10 of installation manual) to see where the furnace falters. Then report that on this forum so some possible causes/solutions can be determined. I suggest you follow the suggestions outlined in the thread that was linked.
 
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Old 12-06-14, 09:06 AM
feh
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Thank you! I'll analyze things and report back.
 
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