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Old 01-31-2012, 02:05 PM   #16
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Gas furnace overheating problem with two solutions - which one is better??


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Originally Posted by harleyrider View Post
Your furnace is made by Carrier corp.Its a mid-efficiency unit.I would not think that the heat exchanger would be plugged it would be very rare to have this happen.Now if you are not good at keeping the filter changed, then the evaporator coil could be plugged.How are you determining that the unit is shutting down by over heating? are you reading a fault code off the main board?
Yes we have not been constantly changing the filter as I believe that we have washable furnace filter installed and we do wash it. Can you DIY clean the evaporator coil? I found this YouTube video but that one seems to be a furnace in a commercial building. We know that it's shutting down by over heating because we hired two HVAC professionals to take a look and both said that the problem was overheating. Currently we have spent around $500 to replace the limit switch, the pressure switch, and the temperature sensor. Although replacing these parts did help (it happens less frequent now), but still maybe once a month the furnace will shut down by itself due to overheating (used to be once a week). Thanks!

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Old 01-31-2012, 02:21 PM   #17
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Gas furnace overheating problem with two solutions - which one is better??


Oh by the way, we are no longer considering the general contractor's idea to replace the current 8" Flue Vent to 10". We hired two HVAC professionals now, one suggested to replace the furnace with a high efficiency one (labor + part quoted US$2600), and the other one suggested to replace the existing terra cotta flue and install the new double wall flue and quoted $3300 (the current set up with terra cotta flue was inherited from a old old furnace that we had before, which was not even 80% efficiency furnace).

For this new development (high efficiency furnace) I have started another thread, please see here.
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Old 02-03-2012, 10:32 AM   #18
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Gas furnace overheating problem with two solutions - which one is better??


since you mentioned a washable filter, you get my take on them!!! They are junk unless you take apart the frame and clean each peice of them. Then put them all back together, once a month or more, depending on your houseold (ie dogs, cats, living in the desert!!! LOL) They tend to get clogged up in the inter layers.

Try this experiment, Go get a cheap fiberglass filter, put it in for 1 week. if the problem goes away, dump that washable filter.

I would further suggest that if your filter area can handle it, try for a 4 inch media filter. There are a couple of places on the internet that sell drop in systems if your return filter is only sized for 1 inch filters. I dont like the hardware store 1 inch pleated filters, as they seem to be very restrictive... your mileage may vary!!!!

here is a sample of the filter type I am talking about. http://www.hayneedle.com/sale/furnac...FaYaQgodCznX2Q

Last edited by bobinphx; 02-03-2012 at 10:36 AM. Reason: add link
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Old 02-03-2012, 01:33 PM   #19
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Gas furnace overheating problem with two solutions - which one is better??


Quote:
Originally Posted by bobinphx View Post
since you mentioned a washable filter, you get my take on them!!! They are junk unless you take apart the frame and clean each peice of them. Then put them all back together, once a month or more, depending on your houseold (ie dogs, cats, living in the desert!!! LOL) They tend to get clogged up in the inter layers.

Try this experiment, Go get a cheap fiberglass filter, put it in for 1 week. if the problem goes away, dump that washable filter.

I would further suggest that if your filter area can handle it, try for a 4 inch media filter. There are a couple of places on the internet that sell drop in systems if your return filter is only sized for 1 inch filters. I dont like the hardware store 1 inch pleated filters, as they seem to be very restrictive... your mileage may vary!!!!

here is a sample of the filter type I am talking about. http://www.hayneedle.com/sale/furnacefilterscommerv8returnairgrillefurnacefilter 1.cfm?source=pla&adtype=pla&kw={keyword}&ci_src=17 588969&ci_sku=QFI081-4&gclid=CNnO9c6Qgq4CFaYaQgodCznX2Q
This is spam!
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Old 02-03-2012, 04:53 PM   #20
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Gas furnace overheating problem with two solutions - which one is better??


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This is spam!
why.....?
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Old 02-04-2012, 08:55 AM   #21
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Gas furnace overheating problem with two solutions - which one is better??


sorry about that, I did not intend to spam. I had a really hard time finding a media filter that would fit in a standard return filter grill. a filter like this was my answer and I thought I would share it. How can I show things that I find on the internet in the future????? Again, I dont want to spam. Thank you.
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Old 02-04-2012, 09:50 AM   #22
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Gas furnace overheating problem with two solutions - which one is better??


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why.....?
Cause it is
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Old 02-04-2012, 09:56 AM   #23
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Gas furnace overheating problem with two solutions - which one is better??


Bob.

No spam for me. Norton blocks every bit of it 4 me. Perhaps his scanner is letting something thru like pop ups. Keep posting, not everyone has a good pop up blocker. A bit of advertising is allowed here as long as it does not lead to a bunch of other commercial sites and overload the server or promote the posters biz.
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Old 02-04-2012, 10:12 AM   #24
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Gas furnace overheating problem with two solutions - which one is better??


They got Norton in Canada?
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Old 02-04-2012, 10:16 AM   #25
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Gas furnace overheating problem with two solutions - which one is better??


Yep. mail delivery too. not that artificial e-mail stuff.
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Old 02-04-2012, 10:25 AM   #26
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Gas furnace overheating problem with two solutions - which one is better??


Quote:
Originally Posted by bobinphx View Post
sorry about that, I did not intend to spam. I had a really hard time finding a media filter that would fit in a standard return filter grill. a filter like this was my answer and I thought I would share it. How can I show things that I find on the internet in the future????? Again, I dont want to spam. Thank you.
You're fine bob. A link to the company you own or work for is spam. Posting examples from the net isn't.
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Old 02-04-2012, 11:17 AM   #27
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Gas furnace overheating problem with two solutions - which one is better??


From the rules:

Users may link to commercial or informational sites as long as you have no vested interest in doing so. Example, someone posts a link to a new tool that they are using or to a leads service they have had success with. We are just trying to stop SELF PROMOTION and not valid discussions. We reserve the right to delete any message that we are unsure of its intentions.
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Old 03-10-2012, 03:19 PM   #28
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Gas furnace overheating problem with two solutions - which one is better??


,,,,,,,

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Old 03-17-2012, 02:50 AM   #29
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Gas furnace overheating problem with two solutions - which one is better??


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Originally Posted by harleyrider View Post
NEITHER............if your furnace is going off on the high limit, it is because the heat being made in the heat exchanger is not getting carried away fast enough to keep a steady temperature in the heat exchanger, causing it to rise above the "limit" of the limit and trip it.....shuting down the furnace. I would suspect a couple different things.........first and most obvious, is the filter clean? Second I would be suspect of the blower and or capacitor being or going bad. As the blower runs its building heat inside the motor......if it gets to hot it will shut it self down, leaving the furnace to heat up and go off on the high limit......after they both cool back down then they run again.
i agree with harleyrider but if you have a/c i would check the coil to c if its dirty that can also cause over heating

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