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

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Icleend up the flame sensor but flame goes out every 5-10sec. and gas valve cliks .Thank you for help Bruno

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Hi, if you have cleaned up the flame sensor, and it continues to go out, you more than likely have a problem in the ignition module itself. The clicking you her is 24volts being supplied to the gas valve because you're auto-pilot stays on long enough for the module to sense the flame and the click is the coil on gas valve being energized.Module shuts MGValve off in a split second to prevent Raw gas from filling up the house.You might try replacing the flame sensor 1st, as it would be a lot less then changing out the module, or main board which ever you have that controls you're system.Just see where the flame sensor plugs into either a module or board, they both do the same if its a hot surface ignitor or pilot flame like you have. I hope this has been of some help to you.Let me know please. Good Luck,

Posted on Nov 17, 2009

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Why is the pilot light is on, but the burners will not light?

It could be a bad switch but it's possible that the flame safety sensor is bad. When you turn the knob the gas valve opens and you should get a flame. The safety sensor senses a flame and allows the gas valve to remain open. If the sensor does not sense flame within 10 secs or so than it will shutdown the gas control valve. If you get a brief flame that goes out after a few seconds than the safety sensor is either dirty or bad. The sensor is within 2-3 inches of the burner orifice and should be in contact with the flame. Most resemble a short metal rod with a thickness slightly larger than a metal coat hanger.

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Ignitor is lighting but silinoid is not opening to let gas through.Roper model # RGS7646KQ3


Your have one of two problem causing the gas to not come on on your dryer.
1) the flame sensor is bad...if the igniter comes on and stays on and doesn't go off...usually within 1 minute the flame sensor isn't working as its supposed to
2) the coils on the gas valve could be the problem...if the igniter does indeed go off within 1 minutes and as soon as the igniter goes off if their is no flame the coils on the gas valve is what would need to be replaced
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FLAME SENSORoldtech2332_113.jpg

GAS VALVE COILSoldtech2332_114.jpg

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No heat, ignitor goes on burner goes on sometimes and after short time goes out. ignitor goes back on, but no burner. what up

If the flame sensor is not returning a good signal, the gas valve is shut off as a safety measure. I surmise that in this situation, the igniter is programmed to fire for a time to flare off any accumulated gas from the initial attempt to fire up the burner.

Check for the following: adequate combustion air supply (make sure inlet vents are clear), proper exhaust venting, flame sensor properly positioned and not cracked or otherwise broken, burner holes are clean and not caked over with combustion deposits (if the flame is uneven and weak right where the flame sensor is located, it will be treated as a failed ignition).

In the worst case, the gas valve is defective and unable to detect the flame signal. It's also possible that a thermostat is sending an overheat signal, but that doesn't account for the igniter sparking a second time after the burner shuts off.

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My pilot flame goes out after a short while and the gas shuts off then as it should. Why does the pilot flame cut out so rapidly?

Because she ain't gettin confirmation of ignition.
Your flame sensor is contaminated most likely.
Get a dry brillo pad and clean that dude. Give it the alabama gloss and the mississippi shine then reinstall and retry.
I have 2 links. Old school RobertShaw kanthal Spark/sensor notes and Auto cycling furnace easy fix.

Let me know dude!

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I hope that I can get this problem resolved. Can there be a thread started to help me through this? I will try to keep this as short as possible, I have a Ducane Mod. CMPB050C3A Nat. gas furnace. The...

say that you have the glow bar (Hot surface igniter) working
if the flame starts make sure you don't trash on the orifice of the burner, you can try to use a piece of wire or someting small to pick on the orifice of the burner, also make sure is not rust bewteen the burners gap where the flame spread to all the burners because if the flame sensor don't feel flame don't stay light up
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I have a goodman GMNT gas furnace Propane it lights off I have a blue flame for about 3 seconds I hear a click on the circuit board and the flame goes out this is doing it constantly. could you please help...

Hi!!! If the flame turns on then off and on then you should change your flame sensor on the gas furnace..YEs flame sensor is shorted..The flame sensor is located by the valve burners it has one wire and is white..Good luck..

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I can smell the gas coming through. The igniter, ignites a small flame at the right end, but that is all. The flame does not light the burners. I did look at the burners, they look fine. Could there be...

It's either the flame sensor or the gas valve.

The sensor senses flame and sends signal to the valve, the valve then sends gas through the burner/s.

If it's a thermocouple (looks like thisbefore installed)
then replace the thermocouple.
It sits right in the flame pattern and they usually cost less than ten bucks.

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