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

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Heater my heater the pilot on the gas furnance wont light

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It is possible that your thermocouple is defective. It must get satisfaction from the pilot to enable the valve to work. If it does not light at all you may check your gas supply or your orfice is plugged or your gas valve is defective.

Posted on Dec 08, 2007

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You are missing a few numbers in the model number so I am unable to research it. You may have a 30 or 50 in fromt of the HXB or something like that.

Get back to us with an exact model number.

Posted on Dec 07, 2007


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I just lite by pilot light and the furnance will not go on. Does this mean that there is air in the line and gas will eventually flow to the unit and start heating?

If your pilot light stays on then gas is to that point. Make sure that you have turned control knob to gas on setting and thermostat is turned up calling for heat. If you still don't have any heat lightly tap on body of the gas valve. I know this sounds archaic but sometimes it works and it doesn't cost much. If your unit has a seperate thermostat you can remove the cover and base if needed to get to stat wires. Disconnect them and touch them together. If this brings the gas valve on then replace thermostat. If not I would change gas valve. Hope this helps you. Thanks

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1 Answer

Gas Furnace Will not light

Hi, normally when you turn the gas off at the flex line valve and leave it off for awhile, the gas has to clear the gas valve and lines up to the pilot. Purge its self of air before it will light again. It will take the electronic ignition several clicks and more before there is enough gas to light the pilot and then open the main gas valve to fire the burners. Tell me, what kind of gas furnace is this when you speak of water? you say the site glass was full and you had to drain it and then the ignitor kept on clicking when it normally only took one click to light it. Please let me know the style as in a split system, a package unit, all in one, or what you have. I will wait to hear back from you. If the pilot does not light right away, then yes let it continue to click and see if it will light. On a heater with the electronic ignition control module on it or a circuit board, this is what tells the pilot coil to energize to light the pilot. It will send power to the pilot coil to open and let gas through to light and same for the main gas valve, will get a signal to open when the pilot is on. It will not open unless the pilot is lite for saftey. I will wait for you're responce.

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1 Answer

Williams gravity vented wall furnance - where is the pilot?

Its in the bottom of the heater behind the vent cover . I don't know where you are but your local gas utility will come out and lite this for free.

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