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We have a 30+ yr old Ultra-Aire wall heater. The pilot light won't stay lit. We are replacing the pilot generator but it isn't working. What can you tell us about the wiring connections

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You need to replace the thermocoupling.
Thats the flame sensor, and they cost around 8 bucks.

If the gas valve does not recieve signal from the sensor that there is flame it shuts down all gas flow.

Posted on Jan 01, 2009

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I AM WORKING ON A COZY W501E WALL FURNACE AND CANT GET THE PILOT TO STAY LIT. i HAVE CHANGED THE GAS VALVE, THERMOCOUPLE,AND THE SENSOR FOR THE HIGH LIMIT. THE PILOT WONT STAY LIT.


Pretty much the only thing that will do that is the thermocouple not generating enough voltage for the valve to say it's OK.
Usually you need to hold the button for pilot lighting for 60 seconds. You can use a meter to check that it's generating enough power. The thermocouple has to be in the pilot flame properly.

Check this video:
https://www.youtube.com/watch?v=suen7QlJl4o

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Or see this site:
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Jandy LG250N pilot won't stay on after releasing switch on gas valve. Main switch on unit is off. I am able to keep pilot flame on for one minute by depressing switch but pilot always goes out after...



Thank you for posting your question here on Fixya.com.



No, the pilot generator or the pilot head itself is the issue. You need a good, solid blue flame across the generator to get enough power to hold the switch open when you let go of the knob. If the pilot flame is week or not aimed across the generator it will not stay lit.



If it is but the generator is old and weak, it will go out as well. If you can see the pilot flame and it is a nice blue color, replace the generator. If it is not, disassemble the pilot and either clean it out or replace it.



If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!


John

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SEt to pilot, Push knob, push pezio ignighter until pilot lights, hold for 30 seconds. if it stays lit turn to on, if it doesn't stay lit, you have a bad thermocouple

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I HAVE A DESA LP VENTLESS FIREPLACE AND THE PILOT WILL NOT STAY LIT


the heater makes use of a millivolt generator which generates a small dc voltage (500-750mv) that is applied to the pilot valve of your main gas valve. when you light your pilot, the flame bathes the generator with a flame. after a delay you release the pilot button. if the generator is working, the pilot valve will stay lit. if the generator is not working the flame will go out as soon as you release the pilot button. change the generator.

Oct 13, 2009 | Desa International Heating & Cooling

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Pilot light will not stay lit on model 465FX-R wall mounted gas furnace. Thermocouple was replaced but still won't stay lit. Gas is on at the meter. Any suggestions?


It is possible that gas valve is bad, however, try replacing the pilot orifice located in the pilot assembly. If the flame is inadequate it will not generate the voltage required in the thermocouple. Pilot orifices are less than $10 and can be found at your local heating contractor's parts counter. Bring in the orifice to match.

Oct 03, 2009 | Heating & Cooling

1 Answer

Do not know how to start pilot light


There should be instructions on the inside of the heater access door. Make sure you are comfortable working with gas heaters. Make sure the shutoff valve supplying gas to the heater is on. Turn the gas valve to "pilot", press and hold it while attempting to light the pilot. Once the pilot is lit, continue holding the gas valve knob down for about 30 seconds. The pilot should stay lit once you release the knob. If the pilot stay lit, turn the gas valve to "on". Replace the heater access door and make sure you have proper water flow and attempt to light the heater. If it will not light, or the pilot will not stay on, you will probably have to replace the pilot generator. It provides voltage to run the heater and after time it wears out and produces less and less voltage. A millivolt heater runs on less than one volt so any power loss can be a problem. If you are able, test the pilot generator with a multimeter to see if you are getting at least 500mv when the pilot is on. If not, you should replace the pilot generator or even the entire pilot assembly. Hope this helps...

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My 1.5 yr old gas water heater has a pilot light problem


YOUR WATER HEATER HAS WHAT IS CALLED A STANDING PILOT-STAYS LIT ALWAYS WHEN THE PILOT GOES OUT YOU LOOSE EVERYTHING. YOU HAVE TO REPLACE THE THERMOCOUPLE WHICH KEEP THE PILOT LIT. ONCE THE PILOT IS LIT THE THERMOCOUPLE SENDS IN MILLIVOLTS TO THE BURNER TO SAY ITS READY FOR BURNING
IF YOU ARE NOT FAMILURE WITH THIS REPLACEMENT PLEASE FIND SOME ONE WHO CAN. IT IS NOT HARD TO DO ASK A NABOR OR FRIENDS SOME HAS TO KNOW HOW. SERVICE COMPANYS ARE OUT FOR THE MONEY FOR A 10 MINUTE JOB

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Nov 24, 2008 | Clairion Convection Heater - HC-1500

1 Answer

Less then a yr. old double sided wall heater


First make sure the thermostat is working right. Make sure the wire connections on the valve are good and tight. If all good, culprit is the thermocouple or pilot generator also called a thermopile. Different style and names, all have the same purpose.

Dec 12, 2007 | Heating & Cooling

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