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Old 11-09-2012, 10:44 PM   #16
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Auto isn't working on my system


thats the hi limit..... what did he say was wrong ....... its old but if its safe and you do not mind throwing money out the chimney let's see if we can fix it....

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Old 11-09-2012, 10:57 PM   #17
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thats the hi limit..... what did he say was wrong ....... its old but if its safe and you do not mind throwing money out the chimney let's see if we can fix it....
He said it was the limit & thermostat. Previously, he had given the $600 - $700 estimate to my wife. I'm going to have a guess that changing that part out shouldn't be anything as costly as that. I know that in an ideal world, I would replace everything. But right now, 4k .......

Thanks for the reply, I appreciate it.

Hugh
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Old 11-09-2012, 10:59 PM   #18
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the limit should be no where near 700.....
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Old 11-09-2012, 11:19 PM   #19
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So what did you decide to do? Did you pay him that crazy amount or find another tech. It's a $300 to $400 job at best. Maybe 1 hour.
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Old 11-10-2012, 05:28 AM   #20
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The device on the left is the limit that prevents the burner from running. The device on the left is what runs the fan during a heat call when the thermostat is in the fan "auto" mode.
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Old 11-10-2012, 10:31 AM   #21
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I didn't do anything. Prices were left for a total replacement.

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The device on the left is the limit that prevents the burner from running. The device on the left is what runs the fan during a heat call when the thermostat is in the fan "auto" mode.
Beenthere - you said they are both on the left. Can you clarify which is which. (bearing in mind my system just isn't working on auto) May I also ask, any reason why I shouldn't just source the part and fit it myself?

Thanks!!!!

Hugh
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Old 11-10-2012, 10:36 AM   #22
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LOL.. left is limit switch, right is the fan control.

No problem with you swapping out your own parts.
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Old 11-10-2012, 10:38 AM   #23
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LOL.. left is limit switch, right is the fan control.

No problem with you swapping out your own parts.
Excellent - and thanks again. I found the article below, that will help a lot.

Hugh

http://inspectapedia.com/heat/Fan_Li..._Procedure.htm
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Old 11-13-2012, 04:09 PM   #24
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So, I decided that before changing parts myself I would get a second opinion.

Guy came out, agreed that the fan limit was not working. He cut a section out if the casing and checked the heat exchanger - and reported that he was surprised that a unit fitted when the house was built, 1972, had no cracks.

He also checked for the dangerous levels of carbon monoxide the previous guy reported, insisting that the system should NOT be switched back on - and found absolutely none!!!!

So, new switch fitted, everything working just fine - $310.

Thank you all for your help. :-)
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Old 11-13-2012, 06:37 PM   #25
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The part on the left is high temp limit,on the right is fan control.Fan control has been replaced,with a more modern fan/limit control but only fan control side is being used.To me it sounds like the fan center that is on the outside of furnace isn't wired properly.Power should be coming out of fan control,then into normally closed contacts in fan center then to the fan motor.Sounds like this is where you might be wired wrong.Fan center is added when ac was installed.
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Old 11-13-2012, 06:40 PM   #26
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Sorry.Cant type fast and I just seen your latest post.
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Old 11-17-2012, 06:34 PM   #27
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Sorry.Cant type fast and I just seen your latest post.
No problem - thanks
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Old 11-17-2012, 10:51 PM   #28
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<a href="http://tinypic.com?ref=2wokfb8" target="_blank"><img src="http://i45.tinypic.com/2wokfb8.png" border="0" alt="Image and video hosting by TinyPic"></a>
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Old 11-17-2012, 10:54 PM   #29
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<a href="http://tinypic.com?ref=2wokfb8" target="_blank"><img src="http://i45.tinypic.com/2wokfb8.png" border="0" alt="Image and video hosting by TinyPic"></a>
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Old 11-17-2012, 10:58 PM   #30
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<a href="http://tinypic.com?ref=2h4er7l" target="_blank"><img src="http://i45.tinypic.com/2h4er7l.jpg" border="0" alt="Image and video hosting by TinyPic"></a>


While the fan relay runs high or cool speed
If in heat mode the temp delay is bad, if you have a time delay or time/temp delay same goes for therm.
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