Coleman 90+ UPFLOW CENTRAL FURNACE MAIN BLOWER RUNS CONSTANTLY

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  #1  
Old 10-04-10, 07:04 PM
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Coleman 90+ UPFLOW CENTRAL FURNACE MAIN BLOWER RUNS CONSTANTLY

Hi there. My first post so I will try to get it right. I have a COLEMAN 90+ Gas furnace/Air Handler in my house. Coleman 90+ UPFLOW CENTRAL FURNACE
Model No. G9T08016UPC13C
Serial No. (S) ENJM552605
ANSI Z21 . 47a-CSA 2.3a-1999 CENTRAL FURNACE.

The issue MAIN BLOWER RUNS CONSTANTLY NO MATTER WHAT SETTING THE THERMOSTAT IS ON NO MATTER WHAT SETTING THE THERMOSTAT IS ON ... HEAT OR COOL; AND AUTO, OFF OR MANUAL. Has anyone else had this problem? I am pretty handy when working on some things so I will try anything at least once. I do know my limits though. . . .

I would appreciate any advice/suggestions. Thanks in advance. DoubleH
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Old 10-05-10, 02:22 AM
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There could be some sort of jumper wire or direct connection from the R to G terminals of the thermostat.
 
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Old 10-10-10, 04:16 PM
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The circuit board is P/N 031-01267-001A. Is there a place that will check / repair these circuit boards? Where is a good place to buy a replacement circuit board?
 
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Old 10-10-10, 05:01 PM
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There are a number of things that can cause the fan to run as your describe. Imagine how disappointed you will be if you spend money on a new circuit board and discover it's no9t thye problem.

GUESSING that the circuit board is the problem is a diagnostic method of the incompetent repairman.

To make a competent diagnosis you need to understand the various things that can switch the furnace fan on and check and test that non of those are causing the condition. But perhaps you've already done that.
 
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