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I have a luxaire gas furnace and the gas valve keeps opening and closing. no codes when valve not connected, the voltage stays 24 volts. connected it drops out constantly

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Hmmm it seems like the luxaire furnace isnt able to tell if the valve is open or closed by electronic means try replacing the part and see if it helps

Posted on Dec 05, 2016

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1 Answer

Do not get 24 volts from 120/24 volt transformer how test it?


Yes. There could be a couple of high limit safety devises in the circuit that can open the circuit to the gas valve. Pending your furnace type If your thermostat is calling for heat and the furnace tries to start your transformer is working. High limit safety controls are normally closed. If you have a open limit switch you will not have any continuity through it using an ohm meter or if you test it with a volt meter you will have 24 volts across the terminals of the safety devise. Other problems can be pressure switches, hot surface igniters and control boards. most newer furnaces have a control board that will flash a light code to help trouble shoot the system. Count the flash pattern and look on one of the furnace doors for the flash code directory.

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Does this valve have a standing pilot? if not, if my hot surface ignitor lights up and the furnace fails to light would you consider it to be a faulty gas valve? I am getting a constant 24 volts fro


If your getting 24 Volts to the gas Valve and the gas Valve is not opening replace your gas valve If your not getting a full 24 volts check your Transformer and the ground to the gas valve.If the gas valve still does not open change the Gas valve.

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Frigidaire furnace wont light pilot. we have replaced igniter and pressure switch


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The igniter on my york furnace stays on for a sufficient time but the heat sensor either doesnt work or the gas isnt getting through and there is no gas lighting


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My York Stellar PLUS furnace (Model P2UDD12N07601C) will not stay on; The ventilator fan runs, the main blower runs, the igniter comes on for approximately ten (10) seconds and you can hear the gas valve...


Check gas pressure, inspect manifold & make sure there is not a blockage.Make sure gas is present and main gas shut off valve to furnace is on also check the knob on the 24 volt gas valve and see if it is in the on position , check the MV terminal on the gas valve to 24 volt common with a volt tester to see if you have 24 volts present, if you do have 24 volts at gas valve, replace valve. if you do not have 24 volts at gas valve check high limit control & roll out limits for a open circuit, Good luck.

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2 Answers

FURNACE COMES ON AND SHUTS DOWN WITHIN 15 SECONDS


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control). When all else fails, check the ground connection for corrosion.

Nov 23, 2009 | Heating & Cooling

1 Answer

Rheem force air gas furnace. pilot is li but burners and blowers dont come on


Does gs valve click to come try to come on. Take off t stat jumper w to r to see if furnace comes on. If so bad tstat. If you ahve a volt meter. Check to see if you have 24 volts a tstat. Check to see if you ahve 24 volts to top of gas valve. Check across the two terminals on to of gas valve. If you have 24 volts to valve and valve is not open bad valve. Keep in touch. rus

Nov 19, 2009 | Refrigerators

1 Answer

My Furnace does not turn on. Installed a new igniter/flame rod assembly, still not coming on (I had this same problem before with another furnace which I changed the igniter flame rod and problem was...


Assuming the inducer fan and pressure switch are working fine, your next step is to test the voltage coming to the gas valve. There should be 4 wires going to the gas valve, one is black. This is the 24 volt power side. Unplug the molex connection at the gas valve and while the inducer is running test for 24 volts AC. If you get voltage you have a bad valve. If no voltage you have a bad circuit board. Test the safety circuit and roll-out sensors to make sure all switches are closed. Check for continuity across the switches.

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1 Answer

How to test for 24 vac between R and C


Yes you are right the control voltage of your furnace is 24 volts. Really without a load on the transformer usually runs 28 volts then you put a load on it and it drops down to 24-26 volts. Check the voltage between the R terminal and the W terminal with the selector switch in heat mode. Or move the thermostat switch to heat. R to C would do it also. You could also do the voltage check right at the transformer one side of the transformer is 120 volts and the other side is 24. Look for the black and white wires that is the 120 volt side the blue and yellow or off colors is the secondary side.

Now if it checks low say 24 or 22 your gas valve needs min. 24 volts to hold open the valve that allows the gas to flow into the burners. So if one of the symptoms is related to burners come on for about 3 to 5 min. then shut down and the fan keeps going it is loosing the necessary voltage to hold open the gas valve.

One more thing make sure the air filter is clean as this will cause the heat to build up in the heat exchanger and hit the high limit safety device and cut the gas off. Until the air cools enough to allow the high limit to reset then the gas valve will open and start the process all over again. Dirty A-Coil will do the same thing as the air goes through the coil to get to house. let me know how it goes ken

Jan 18, 2009 | Heating & Cooling

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