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

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

No heat coming from the furnace, no burnt element smell (if there are elements)in the home . filter has been changed. the fan blows on "on" but shuts itself off when on "auto" after a few moments.can this be an easy fix if i do it myself,changing elements or unit ? is there a site that has how to instructions for free ?

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

Posted on Jan 21, 2009

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HEAT PUMP


It is not normal to have a loud buzz associated with the electric heat. Try turning the heat off and running the fan only to see if the buzz continues. The buzz could be coming from any number of sources including an electrical component, the blower wheel, a loose fastener...etc.
The temporary smoke and smell could have been the dust burning off the element if the elements have not been used in a long time. However, if the elements have been running, it could be something got loose in your system and stuck between the blower and the heating elements.....for example, the wiring diagram could have come loose and worked it's way through the wheel. I've also seen owner's manuals left in the air handler that eventually got stuck in the blower. This should be inspected to ensure there is not a fire hazard.

I hope this helps and good luck. :-)

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1 Answer

Have a model 3500A820 furnace that heats but blower doesn't come on. Shouldn't elements go off in this case. Really over heated, scary!


Turn the blower to manual on at thermostat if you can.

Most electric furnaces have a overtemp switch to shut off the elements. If it is auto reset then it could be shutting off and you would not know it.

If its a manual reset it should shut everything down,
its possible that it is not sensing the plenum temp.
If you can trace your blower wires and it is multispeed,if you can see which wire is tied in with
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1 Answer

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fan oven element video. 1, If the fan motor . in the back of the oven is going round and the temperature light is on (normally little red light), but there is no heat then you will probably need a new oven element, these are generally very easy to fit and readily available from our website these can be tested with a electric meter.
To gain access to the element .you will have to remove the back plate from inside the oven. Once removed you will see the fan and element,. if you look closely at the element .you will probably see a small hole burnt in it where it has blown. Sometimes however there is no evidence of a fault but the element is open circuit ie: broken inside the element casing, either way it will need replacing. Some elements will are fixed from inside the oven and some are held in place by nuts from the rear of the machine.
2, If your fan oven is getting warm but takes a very long time to cook or is burning the food more on one side than the other, then you need to check if your oven fan motor is working you will see the blade turning fast if it is ok. if the element is heating but the fan motor is not blowing the heat into the oven then you need To replace the oven fan motor is a little more expensive and a bit more involved.
3. If you have the opposite problem ie: your oven is over heating and burning everything then you will need to replace your oven thermostat
4, A quite common and easily overlooked answer is if your oven is not working at all ie: no heat and no fan then the chances are that someone has put the oven timer into AUTO mode, simply put oven back to MANUAL mode and all should be working again.


For all Free appliance repair videos visit our VIDEO TUTORIALS

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Is there a setting on the thermostat for Auto or Fan? If so, make sure it is in the Auto setting. You will have a contactor that turns on the elements and a relay for the fan. Follow the wiring diagram to see which relay energizes the fan then unplug it to see if the fan stops.

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unfamiliar with watt restrictors.
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1 Answer

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Hi!!!remember everytime you turn on yout furnace you will have a strange odor thats all the dirt that is burning from the heating element if your using the emergency heta if not the what you are smelling is your fan motor replace it and you should be fine..Good luck..

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