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Problem for Bryant 462AJC021BA Air Conditioner
Bryant-Carrier Furnace Fan Stays On
When furnace heats to target temp. and ''heat'' indicator goes out the fan does not turn off by itself even after air cooled for an hour. I can drop power and fan will stay off. This unit is mid/late 80's and 20 years old
I suspected old mercury t-stat and upgraded to digital Honeywell. Wired 4 wires per the diagram, (unit has no heat pump) it didn't fix problem. I was told to exchange t-stat again but it didn't help. I suspect a sticking heat relay on circuit board but not sure because I manually turned up temp. on t-stat by just 1 degree above target temp. and the furnace heated from 68 to 69 and then the fan turned off by itself. I've done this for 3 days in a row and it's worked every time. This is confusing, What can I look at next?
I suspected old mercury t-stat and upgraded to digital Honeywell. Wired 4 wires per the diagram, (unit has no heat pump) it didn't fix problem. I was told to exchange t-stat again but it didn't help. I suspect a sticking heat relay on circuit board but not sure because I manually turned up temp. on t-stat by just 1 degree above target temp. and the furnace heated from 68 to 69 and then the fan turned off by itself. I've done this for 3 days in a row and it's worked every time. This is confusing, What can I look at next?
Comments:
Oct 17, 2009
- Thanks "Therinnaiguy" Is there any way to tell for sure or test the small relay?Best Solution
posted on Oct 17, 2009
I suspect a bad fan relay or bad fan control. Maybe the longer the control or relay is in the on position the more chance of it sticking on.
Comments:
Oct 21, 2009
- Yes, check for voltage coming out of the relay if you can find the right one. If the relay is not replacable, you will need to replace the main board. Replacable relays are cheap and easily replaced. Fan controls cost much more.Yes
No
Solution #2
posted on Nov 14, 2009
Hi, you have replaced the stat several times, and adjusted the anticipator so its not the stat.This is a split gas/elect unit, and working on these for many years and looking at some of the solutions given, they are right.You need to be looking at the Furnace fan control.Units of that age they do tend to stick open and run constantly.I doubt its the fan relay, maybe if you were in the cooling mode.Fan controls are not that expensive. You probably have a Honeywell 7" to 11" Probe, with the auto/manual button, with a temp dial to set you're on off temps. I would inspect the heat exchanger for any signs of cracks or bulging being its that old. If you find any, you are looking at carbon monoxided and should be thinking about an upgrade soon.Also flame roll out.I am thinking of you're safety is all.If you do have this type of fan control, there is a tab that has to be cut before you install for 24v. control.It comes set for 120v. and will burn out all of your 24v. componants.Those old Bryants will run for years. Good Luck!
Shastalaker7
Shastalaker7
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