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

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Furnace sometimes will not stay lit

Blower will come on igniter lite flame starts but when main blower comes on flame goes out may cycle one or two times them stay on replaced the flame sensor no change is it my control board?

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Check the heat exchanger for a crack or hole. The room air blower is blowing back into the heat exchanger extinguishing the flame. Have it checked out today. Did you get it checked yet? Now. Have I stressed to you to get it checked out yet or have you been overcome by Carbon Monoxide yet?

Posted on Dec 19, 2008

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Furnace won't stay lit. Intertherm Model M2RC-080A-16BN. Ignightor glows, flame starts and after a few seconds the flame shuts off. Then it starts the cycle again. It goes thru this cycle a fe


It sounds like the flame sensor is bad. If thats not the case you may need to replace the control board. You should make sure the flame sensor is directly into the flame.

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My Ruud achhiever 90 starts to fire but as soon as the blower fires the burner goew out. I also noticed that the "igniter" on the end isnt firing. Could that cause the burner to not stay lit when the


There is an ignitor and a flame sensor. If the ignitor does not ignite the gas after a time, it goes out. If the flame sensor does not detect ignition the gas valve closes. When you start it you should see the ignitor come on like a light bulb and glow, then the gas valve opens and you get ignition. Then the flame detector turns on when the ignitor goes out. Flame detectors are like a chrome wire that has one connection to it and it sits part of the way in a burner. They get dirty and corroded. When that happens it shuts down. You can clean the flame detector with steel wool of scotch brite pads. Dont get too carried away doing that though.

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1 Answer

Pilot light goes out when gas turned on


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I have a ruud furnace/airconditioner Model:UGPN-07EAMER, Serial: FU5D302F390401344. When the thermostat calls for heat, a little motor (within the furnace itself) or something kicks on, the burners ignite...


Hi, this motor is the inducer motor, which is the first thing to start on a call for heat. Everything seems to be going through its sequence of operation just fine, but then shutting down on a safety. Look on the panel for a chart that should tell you by the number of flashes and color of the leds what is wrong. It is locking out for some reason, could be several of many. Next to the pilot, you will have a flame sensor. The metal tip sets in the pilot flame. When they get dirty, they will cause the furnace to do just as you say, run and then lock out. You can take a piece of sanding cloth and sand the metal tip on this flame sensor. If this is the problem, it will start and stay running. Also, look for this chart I have told you about, as it is there to help you locate which safety is giving you the problem. My bet is the flame sensor. Please keep me posted, and rate me on my help to you. The flame sensor also has a electrical lead that is attached to it going to the board, so you will see it.
Sincerely,
Shastalaker7
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Jan 06, 2011 | Air Conditioners

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Check your filter to make sure it is not plugged. If it is plugged - replace with filter recommended for your furnace. Every manufacture recommends you have your furnace checked and cleaned on an anual basis to keep itrunning safely and at it's top efficiency. If the filter is plugged or the blower wheel plugged, the furnace will shut itself off. Make sure all registers are uncovered - suppply and return registers.

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Hello, I have a Amana Air Command 80 model #GHI90A50, 22 years old. This furnace is on its third ingnition module (last one two yeras ago). The symptom I am trying to diagnose has been ongioing since this...


If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

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Will light and remain lit 5min. 30min i dont think its thermocouple thinking something with the safety tilt


First, for those of you who might not know, "What is a flame sensor?" A flame sensor is a safety device. When your furnace's main burners ignite (light Up) the flame sensor picks up the heat from the furnace's main burning and says, "YES," and sends a signal back to the main furnace control board saying that it is OK to let the main burner stay on. Or if the main burners do not ignite, the flame sensor does not pick up the heat and says, "NO" to the main control board, Shut That Gas Valve and Main Burners Down! Thank God we have safety controls like the flame sensor. Most of the time, after turning your furnace's power off, you may clean the flame sensors with light sand cloth, emery cloth or steel wool. Reinstall the flame sensor and you are back in business! Over the years flame sensors can build up a light coating of burned-in dust and dirt. This insulates the flame sensor so that it doesn't sense the heat of the flame well enough, by cleaning it you have almost restored it to its new condition.
Seldom, but sometimes they do go out completely.

Nov 08, 2010 | Air Conditioners

1 Answer

I have a Rheem (Criterion) unit and i'am having promblems with the main burner staying on. When i turn the unit on everything operates like it should up to the main burner staying on.Once the main flame...


Run a wire from the sensor down to the control board conector. Bypass the sensor wire around the connector in the blower deck.
The connection can be wire nutted on the sensor lead with the wire (16 or 18 guage stranded wire works) routed through the blower deck to the other side of the plastic wire connector on the blower deck.
The Sensor operates at high voltage but very low current. The connector will sometimes fail due to humidity or wear.
I have seen this on the Rheem or Ruud furnaces.
Hope this helps.
Matt

Jan 07, 2009 | Air Conditioners

1 Answer

Rheem gas furnace pilot lights, but no burners or fan


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1 Answer

I have a sears forced-air furnace that automatically lights. It will go on when I first turn up the thermostat. It burns and produces heat for about 10 to 15 minutes. Then the burner goes out and it starts...


You probably have a bad Thermo-couple . It is a copper looking rod that sets in the flame of the pilot lite It also has a copper wire that goes to the main valve and connects with a 1/4-3/8 nut or a metal clip. The purpose of this part is to tell the computer that the flame is lit and all is good, but it fails often with the same symptoms.
Be very carefull not to touch the white ceramic igniter, for it will fall apart and that will cost you 40.00 bucks to replace. The last time I replaced my thermo coupler on my furnace, it cost 9-10 bucks and most hardware or heating supply will have it.
. But remember use the proper tools, don't just grab any old pliers, look very carefully and u will be ok.
good luck, mule460

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