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Pilot is lit, but does not ignite heater - Williams Heating & Cooling

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Take the red and white wires going to your thermostat and jump them together. If the unit starts, you have a bad thermostat. If not, at the furnace, jump out the terminals where the thermostat wires are connected to. If the unit starts, you have a bad thermostat wire or connection. If not, you will need to check for 24 volts at the gas valve while the thermostat is calling for heat. If yes, bad gas valve. If no, bad transformer.

Posted on Jan 31, 2010

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Posted on Jan 02, 2017

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When I try to use my Thermolaire model SU402E, the pilot lights( and stays lit), but the main burner will NOT ignite.. any suggestions as to what could cause this if the pilot stays lit?


Bad igniter? When you 1st try it the gas valve will give enough gas that you would get the burner lit if the igniter was glowing red. If you're desperate you can light the igniter area w/ an aim n flame, but you definitely want to do that w/ caution and crank up your t-stat so the furnace stays on awhile Cuz you'll have to do it again for heat or buy an igniter($40 or so)

Jan 14, 2015 | Heating & Cooling

1 Answer

Pilot light stays lit but burners do not ignite


check to see if pressure switch wires are tight and pressure to pressure switch then check safety circuit make sure wires to gas valve are tight

May 23, 2014 | Jandy Lite 2 Natural Gas Pilot Light...

1 Answer

Pilot won't stay on


Burners don't have anything to do with the problem of pilot not lighting. Is the problem that flame will not 'stay' lit? Or you can't even get a flame to ignite? If former: possible bad pilot generator or bad gas valve. If latter, possible bad gas valve or no fuel to ignite.

Dec 23, 2012 | Hayward H Series Pool & Spa Heater 400k...

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Pilot won't stay lit on furnace


Is that pilot automatic? If so then a quick easy fix for this is to located the sensor and replace it or clean it up with sand paper. After ignition the control is looking for verification of ignition from that sensor. How to videos

Sep 30, 2011 | Heating & Cooling

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How do I fix a pilot light that will not stay lit?


Check the gas valve. Sometimes the springs in the valve can wear out.
Another thing is the pilot itself. Inside the pilot is a little rod that stays heated to ingnite the igniter. It can become dirty or corroded and won't allow the pilot to stay lit.

Apr 19, 2010 | Vanguard International Blue Flame - Large...

1 Answer

Blower but no heat, no gas or no pilot ignition?


The pilot has to be lit.And to do so turn the knob to pilot.Then press it down and gas will come threw the pilot,then light the pilot,and hold the button down for about 45 seconds,count slow.The pilot has to heat the thermocouple up before the pilot light will stay on.Once it stays lit,turn the knob to on.

Oct 20, 2009 | Heating & Cooling

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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...

Sep 27, 2009 | Pentair Minimax Ch 400,000 Btu Propane...

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Water heater pilot wont stay lit


try cleaning the top of the pilot light jet if you can get to with small brush then blow it clean with a compressor.

Aug 30, 2009 | Rheem 50 Gallon FVR NATGAS Water Heater...

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Patio heater ignites and stays lit with pilot. Then goes out.


Press and hold for 60 seconds and then it should stay lit (this is a safty feature on most models!)

Dec 18, 2008 | Endless Summer gwt501a Open Flame Patio...

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