Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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I have a Carrier electric furnace/ac.the fan works when "on" .shuts down after few minutes when on "auto".No heat comes out at any setting tho.filter is changed, had no burnt element smell in house (if that matters) the model #is FA4ANF024

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Was the thermostat replaced? if so there is a gas/electric switch on the back that should be moved if not may be a bad control board

Posted on Jan 21, 2009

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The unit is on Heat, Fan Auto it's 36 degrees outside, Thermostate set on 73 Actual temp inside 70. Unit runs continuously. How can I get more heat. I tried Emergency heat and that doesn't help.


Have you cleaned the air return filters ? Wash them, don't vacuum or brush them. It damages the filter screen. Sometimes a thermostat will be out by a few degrees. If the filters are clean, try turning the temp down a bit to 65 degrees and see if the air con shuts down. ( If your room temp is showing 70, it should switch off the machine) If it doesn't turn off, keep reducing the temp by 5 degrees at a time and wait a few minutes each movement to see if and when it shuts down. If the machine keeps running, I would suggest your thermostat is shot and you will need a new one.

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The line is frozen and the fan will not shut off. How do I turn the fan off?


Shut off the electric to your furnace.

the reason that the line is frozen is because of one two things:
First there is enough air passing over the A coil on your furnace.
Could be dirty filters - closed vents- furnace fan will not run/ stops and starts (bad motor).
Second the charge on your a/c unit is low.

John

Jun 24, 2014 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

My furnace works on ac and blows on ac but on heat it does not blow but i hear a humming sound coming from the furnace


Most furnace operating on Oil or gas will heat the combustion chamber before starting fan to prevent cold air draft at start-up, can last a minute or two. Eiter the main flame does not come on or the chamber thermostat have fail. Try to modify fan option on room thermostat from auto to on. Cold air coming out: burner problem or no more oil or gas, warm air: burning chamber thermostat problem, leave room thermostat fan option to on until repair.

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1 Answer

My Ruud furnace used to regulate 1 deg +\- the set temp. Now it regulates right at the set temp and the fan cuts off while the burner continues to fire for a minute or so then the fan kicks back on for...


Hi,
It appears to be the fan limiter switch. It comes on at a certain temp when heating up and shuts off on the high end of its setting. Once the burners are shut down, the fan continues for a few minutes to cool down the burners. The limiter switch is adjustable but it sounds to me to be defective and should be replaced. Good luck and stay warm, :-)

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Carrier ac fan works when remote is set to fan. When set to ac it come on for a few seconds then the unit shuts off. The filters are clean. I took the top cover off and there are no leaves bees etc...


you have an electrical short or need capacitor replacement because when you set to cool compressor tries to star but take more current then trips.

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1 Answer

Furnace runs OK, but blower runs again a few seconds later


Could be a defective thermostat in the plenum.
When a gas furnace shuts down the fan(blower) will run until the plenum cools to the safe range. Usually 1 and 1/2 minutes.
Intermittent operation is a defective thermostat or relay.

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1 Answer

Fan works on "on", shuts itselfoff on "auto",no heat either way,


Sounds like the themostat isnt properly set up check the back and make sure the gas/electric switch is properly set

Jan 21, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

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