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Old 01-19-2011, 09:21 PM   #1
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Carrier Troubles


I have a Carrier weather maker 8000,

Last week it stopped working, flashed code 13 - limit circuit lockout. We tried several of the tips shown on this website, but the only thing that worked was to run the furnace with both the filter out, and the top grill off, exposing the blower wheel etc.

We called a Pro in, and he said it was due to restricted air flow, and all we would have to do was get our ducting cleaned and it would be fine.

Ducting was cleaned, the furnace worked great.

Now, a week later, its doing the same problem, BUT, now its blinking code 34 - Ignition Proving Failure, which isnt true, because the flames ignite, they just turn off after 5 seconds. I took the filter off, left the top grill on, and it works...

So the furnace works great, as long as we dont have a filter in it. THe LED light stays solid and its all good... But why would the furnace blink code 34 (and yes, I checked repeatedly that it was 4 flashes and not 3) and not 33?

The only variable this time should be the filter hence air flow.

Any tips before I have to call a Pro in again?
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Old 01-19-2011, 09:30 PM   #2
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Of the tips on this website, did you or your Pro try cleaning flame sensor? Maybe flame going out because sensor is dirty?
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Old 01-19-2011, 09:32 PM   #3
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clean the flame sensor
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Old 01-19-2011, 10:08 PM   #4
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Thanks!!

I never thought that little piece of metal would make such a huge impact. Here I was thinking it was all air circulation....

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Old 01-19-2011, 10:11 PM   #5
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did it fix it?
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Old 01-20-2011, 12:00 AM   #6
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So far! The filters in, the unit is all closed up and its still working!
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Old 01-20-2011, 06:42 AM   #7
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For pros on this site- Even if cleaning flame sensor seems to solve issue, do you recommend the small investment in replacing it with a new one?
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Old 01-20-2011, 03:24 PM   #8
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For pros on this site- Even if cleaning flame sensor seems to solve issue, do you recommend the small investment in replacing it with a new one?
Only if you used sand paper to clean it.

Should only use steel wool or 3M scotch pads, so as not to scratch the rod while cleaning it.

Its really just a piece of metal. Nothing really special about it.
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Old 01-20-2011, 05:07 PM   #9
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exactly, no you USUALLY can just clean them. No need to replace it if it works with a cleaning. However, the only way to know how good a flame signal your are getting is by testing the flame signal output.
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Old 01-20-2011, 05:11 PM   #10
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Originally Posted by hvactech126 View Post
exactly, no you USUALLY can just clean them. No need to replace it if it works with a cleaning. However, the only way to know how good a flame signal your are getting is by testing the flame signal output.

I knew I was forgetting some small detail.
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Old 01-20-2011, 07:41 PM   #11
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The more air the the heat exchanger can get the easier it will run. Just like a air filter on a car.
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Old 01-20-2011, 07:48 PM   #12
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One of my co-workers got a couple slivers of steel wool stuck in his finger. Got infected and required a doctor to remove. I hate that stuff as it is easy to get slivers from. Wear gloves when using it is my advice.
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