An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert who has answered 200 questions.
An expert whose answer got voted for 20 times.
Re: No Pilot Light
This device actually uses a thermopile it is part number P5047541. There are two things to check here ensure that you have had the right part installed be verifying the part number and also check that the sensing end of the thermopile is directly in the path of the flame.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Make sure that the thermopile is receiving enough heat from the pilot and if it does, check if the hi limit is good, check and tighten also all of the wiring connections, before replacing the gas valve.
This symptom indicates something wrong with the millivolt system. Start by checking the wires from the thermopile to the gas valve, insuring they are all tight and in place. Check the hi limit thermostat, if you have an ohm meter it should read .1 or .2 across it. With you meter set to dc millivolts, and flame present on the pilot, read across the thermocouple wires (red and white) to see the millivolts generated, with the thermostat off and the gas valve in pilot position you should get approx 600 millivolt plus minus 50. The pilot will have to be on for a minute or so to get maximum millivolts. If the millivolts are correct, hi-limit closed, and all wiring is connected, you likely have a faulty gas valve. If the hi limit reads more than .1 or .2 replace the limit, if you are not getting the millivolts from the thermopile, replace it.
If the pilot flame does not hold after releasing the button for at least 20 to 30 seconds, try to clean the thermopile and tighten all wiring connection on gas valve, thermostat and hi limit the repeat the process. The thermopile must be heated by pilot flame in order for it to generate small amount of voltage to open the pilot valve. If this does not correct the problem, try replacing the thermopile.
Check if the the gas pressure is sufficient (as stated on unit's nameplate). Check if the hi limit device is good. Check also if the thermopile (cylindrical metal with two wires standing behind the pilot hood) is receiving enough heat from the pilot flame. The voltage generated by thermopile should be 500millivolts in order to open pilot and main valve. If there is 500millivolt on gas valve thermopile and the pilot flame does not stay lit, you have to replace the gas valve. If the thermopile is glowing red and the voltage generated does not reach 500 millivots, you have to replace the thermopile.
there is a small adjustment screw on the gas valve,turn it clockwise to increase pilot,if that does not work the vent cap on the gas regulator on the back of the unit could be stopped up,remove that cap ,clean out or replace unit can operate without it just fine.If you increase the pilot and it still wont stay lit replace the thermocouple
Ensure that gas is getting to the pilot , or you may have a devective pressure regulator. If gas is getting to pilot and pilot is turning off, then you need to replace the thermocouple. The thermocouple function is to turn off the gas if there is not enough temperature, so to prevent gas leaks if the pilot light goes off. Near to the pilot light there
should a part similar to a small metal tube directly in contact with the flame. Thermocouple is wired back to the gas valve. When the pilot is on, and temperature is steady, the thermocouple will generate a small voltage that will keep the
gas safety valve open. In case the pilot light goes off, the thermocouple will cause the valve to close. When you hold the pilot light button , the thermocouple will normally reach enough temp to keep valve open. If the termocouple is faulty, it will turn off as soon as you release the igniter button. Replacing thermocouple is an easy repair.
Call the number listed on the owners documentation to get the replacement part.
You can not check a thermocouple by resistence. You have to check it by millivoltage when it is hot and sensing it should be above 500mv. I would be willing to bet that you have some type of particulate in the gas valve that is causing this problem.