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Old 12-23-2011, 09:04 PM   #1
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Bryant Plus 90 furnace Blowers Constantly on.


Hey guys, I looked through a couple threads on this forum about this same or similar issues, did some troubleshooting steps and nothing helped.

I found a burnt solder spot, where the relay pin was soldered, I cleaned it and resoldered it and also a couple visible bad solder connections on the board and that didnt help.

After this I ordered the two relays online for cheap (there are two side by side on my control board Hk42FZ011) thought one or both may be welded shut. Replaced them and nothing.. If I pull the white Blower wire on the control board the blower turns does turn off.

I ordered a new control board. Its a replacement for mine, http://www.air1supply.com/ICM282-Fur...IER_p_115.html

Just installed it and the issue remains. Blower constantly on when there is power to the furnace.

We've been using the power switch (looks like a light switch) to turn the furnace off once the house heats up to 70. I know the thermostat is working fine. I pulled it off the wall and nothing changed, blower was still on. My Father gave me a new one also (he had a spare) and same problem.

Any help would be greatly appreciated! Thanks!

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Old 12-23-2011, 09:10 PM   #2
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Bryant Plus 90 furnace Blowers Constantly on.


did you try disconnecting the stat wires off board...and powering the unit up..this will eleminate stat,subbase,and wiring to stat.....

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Old 12-23-2011, 09:15 PM   #3
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Bryant Plus 90 furnace Blowers Constantly on.


Yes I did try that, on the old board and new one.
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Old 12-23-2011, 09:19 PM   #4
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Bryant Plus 90 furnace Blowers Constantly on.


Did you test the limit switch before replacing board
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Old 12-23-2011, 09:23 PM   #5
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Bryant Plus 90 furnace Blowers Constantly on.


not sure on this model furnace....see if there is safty roll out switch in blower box on either side of blower...these trip and cause blower to run all the time...
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Old 12-23-2011, 09:36 PM   #6
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Bryant Plus 90 furnace Blowers Constantly on.


I'd be looking at the limit, safety roll out switches or lightly tapping the board fan relay to see if it was sticking But......
I just came from a customer complaining about the same problem but it turned out that what they thought was an on/off switch(looked like a light switch) for the furnace was actually wired up as a summer fan switch. So the just in case your thermostat is set for 20 when you are shutting off that switch... Can the furnace still fire up when the thermostat is calling for heat and that switch is off?

Last edited by how; 12-23-2011 at 09:46 PM.
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Old 12-23-2011, 09:41 PM   #7
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Bryant Plus 90 furnace Blowers Constantly on.


It has a high temp limit switch below the burner box and should look like this one. Will cause the fan to run non stop if it is stuck open from overheating/poor airflow.
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Old 12-23-2011, 09:46 PM   #8
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Bryant Plus 90 furnace Blowers Constantly on.


yuri...he said he turns switch on and off to heat house....if limit was open would the inducer and igniter still work???????? not real familiar with bryant
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Old 12-23-2011, 09:47 PM   #9
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Bryant Plus 90 furnace Blowers Constantly on.


The only reason blowers blow consistantly is due to a high temperature limit switch tripping, meaning your furnace overheated. You can replace the limit switch or reset it if it is resettable but most likely it will trip again until the air flow issue is corrected. The limit switch tripping is only an indication of another, bigger problem.

hey, one more doesn't hurt.
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Old 12-23-2011, 09:50 PM   #10
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Bryant Plus 90 furnace Blowers Constantly on.


No, the furnace is totally off when the switch is off.
I didnt notice any safety switch, there is this cap looking thing. (in one of the pictures)

I did not check a limit stitch?


http://imageshack.us/photo/my-images...223183907.jpg/
http://imageshack.us/photo/my-images...223184006.jpg/

http://imageshack.us/photo/my-images...223184021.jpg/
http://imageshack.us/photo/my-images...223184035.jpg/

Thank you Guys!
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Old 12-23-2011, 09:52 PM   #11
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Bryant Plus 90 furnace Blowers Constantly on.


bryant/payne/carrier are virtually identical and owned by carrier. he would not have heat if the limit is open and it should show the appropriate error code which he needs to let us know if that is happening. if it is weak and fluttering or intermittent then he could have heat and then it sticks open and keeps the fan running. usually those controls from been ridden/excessively cycled can do that as well. some of the descriptions of these problems lately can be a bit vague or misleading but we do the best we can.
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Old 12-23-2011, 09:55 PM   #12
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Bryant Plus 90 furnace Blowers Constantly on.


the limit control is HARD to see and get at with that unit but it definitely is there behind the white intake piping and looks like the pic I gave you earlier.
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Last edited by yuri; 12-23-2011 at 09:57 PM.
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Old 12-23-2011, 09:57 PM   #13
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Quote:
Originally Posted by yuri View Post
bryant/payne/carrier are virtually identical and owned by carrier. he would not have heat if the limit is open and it should show the appropriate error code which he needs to let us know if that is happening. if it is weak and fluttering or intermittent then he could have heat and then it sticks open and keeps the fan running. usually those controls from been ridden/excessively cycled can do that as well. some of the descriptions of these problems lately can be a bit vague or misleading but we do the best we can.
thanks that what i thought i agree seems vague about some things going on and don't make sense...like you said we'll do the best we can..ben
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Old 12-23-2011, 10:01 PM   #14
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Bryant Plus 90 furnace Blowers Constantly on.


they try but one of them was checking for voltages at the pressure switch while doing the self test on those boards and that never works, he mentioned it later and it made sense to me. self test on carrier/bryant/paynes just energizes the components one at a time to show U if they work but does NOT follow the ignition sequence.
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Old 12-23-2011, 10:04 PM   #15
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