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Old 10-21-2008, 03:39 PM   #1
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carrier furnace problems..still


my carrier furnace isnn't working properly. the fan/blower runs constantly on low. the pilot light stays lit , but no flames on the burners.

i replaced the t-stat , the transformer and the fan control circuit board. nothing has changed anything.

needin' some help
thanks kevin

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Old 10-21-2008, 04:17 PM   #2
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carrier furnace problems..still


Model#, serial# 80% or 90% furnace?

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Old 10-21-2008, 04:52 PM   #3
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carrier furnace problems..still


Sounds like you replaced everything but the the one part staring you right in the face.
If this is a true pilot like you say than it has three wires going to it. Green -white and yellow. This is a heat activated switch that first lights the pilot and after the pilot has sufficiently heated the metal warp switch built into it, the warp switch turns on the main burners. Try taking the handle of a a screw driver and tap the pilot valve body. If it does not activate the burners the pilot is most likely bad. Sometimes it's the valve itself..but not very often.
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Old 10-21-2008, 05:47 PM   #4
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carrier furnace problems..still


carrier model 58gs100-8a...ser serial #2688a 05124. series 100. the fan control board is icm271. thanks for your time and help
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Old 10-21-2008, 06:02 PM   #5
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carrier furnace problems..still


would a bad pilot keep the fan running low all the time regardless of the t-stat setting? ??? the metal warp switch is where the 3 wires are going ? i understand that that switch being bad could stop the gas from coming on , but how would it keep the fan running on low all the time?

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Old 10-21-2008, 06:24 PM   #6
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carrier furnace problems..still


Is it running all the time even if there is no call for heat? If there is a call for heat your fan will run on a time deley .
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Old 10-21-2008, 06:39 PM   #7
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carrier furnace problems..still


even with no call for heat. the only way to get it to stop is to turn off the switch on the back like a light switch
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Old 10-21-2008, 06:51 PM   #8
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carrier furnace problems..still


Sounds like you have a limit switch open then.
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Old 10-21-2008, 06:58 PM   #9
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carrier furnace problems..still


how do i check it ? is it one of the big black switches on the circuit board fan control thing ?
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Old 10-21-2008, 06:59 PM   #10
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carrier furnace problems..still


i was sure before that the fan was running on low...but now i am not so sure maybe it's high. i did look for the three wires..but mine has 4 going to what i think is the gas valve thing...3 black and one white
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Old 10-21-2008, 07:13 PM   #11
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carrier furnace problems..still


You probaly have 2 or 3 limit switchs on your furnace. one might be up by the flue on top of the furnace, anthor in the blower compartment, anthor might be located in the middle of the lower part of the furnace (behind gas valve).also maybe on either side of the burner box. They might have manual red reset button on top. If you locate these limits bypass them one by one until you get to the one that is open causing fan to run, if you have a meter that would be even better. I've worked on carrier furnaces my whole career but I'm having a hard time picturing what your unit looks like. So I am just going by where most limits are located on carriers
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Old 10-21-2008, 07:28 PM   #12
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carrier furnace problems..still


ok i just found a reset switch for the vent safty shut off. got gas now but no fan. i bet that was all i had to do but i ended up changing the t-stat .fan control board and transformer..so how do i get my fan running at the same time ?
thanks !!!
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Old 10-21-2008, 08:02 PM   #13
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carrier furnace problems..still


you want your blower fan running at same time? It should come on by itself on a time deley after furnace has fired.
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Old 10-21-2008, 08:47 PM   #14
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carrier furnace problems..still


ok now the fan comes on and when the burners light the fan stops. after a minute the fan comes on and runs. everything is cool but why does the fan run for a few seconds before the burners come on then stop when the burners light? after the burners warm up the blower comes on and all seems normal
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Old 10-21-2008, 09:14 PM   #15
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carrier furnace problems..still


Not really sure i have an answer for you on that one, unless you have an older model carrier that brings the fan on temp and not a time deley. If thats the case when your fan started the first time it cooled down the heat exchanger low enough to shut off the fan and once your furnace heated up enough your fan ran normally. Unless you have wired your new t-stat or circuit board wrong.

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