PILOT LIGHT WONT STAY LIT i CHANGED THERMOPILE

The system I am familiar with uses a vapour pressure type thermocouple and if the pilot remains lit the thermocouple is working as it controls the gas for the pilot and the burner at the same time from the same source - if the gas control is ok and the flow isn't prevented by the thermostat then if the pilot remains alight, there should be a flow of gas and the burner should light - unless the gas jet is blocked or something else, some other type of blockage is preventing the flow of gas to the burner...

I suggest you check the gas jet and the flow of gas to it...

Check the new thermopile with a millivolt meter and make sure it has the correct output not connected to the gas valve.If it does,then the gas valve is defective.Make sure to test ONLY the thermopile.If it does not generate enough millivolts the gas valve will not open.If the piliot is dirty it will not generate enough heat for the thermopile.Make sure you have a good,strong,blue flame at the pilot.You said the piliot will not stay lit?If not then start by blowing air back through the piliot where the flame comes out with compressed air.hopefully that will clean it well enough.If not you may have to take the pilot tubing loose from the valve and use compressed air to clean it.Make sure when you reconnect the tubing to the valve USE FINGERS ONLY to start tyubing or you may crossthread the tubing....and thats NOT a good thing.Good Luck.

Hi there.
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.
Regards.

If you are referring to a gas fireplace:

• Make sure the pilot knob is turned from "pilot" to "ON" or it will never run.
• If the pilot knob is "ON", and the pilot is lit, but the burner won't light, it could be a bad Thermopile. The thermopile is the other safety mechanism in the pilot assembly that controls the burner.

Thermocouple keeps the pilot lit.
Thermopile keeps the burner lit.
Please specify what won't stay lit...
If it's the burner, you may need to change the thermopile as well.
If the pilot still won't stay lit, you will want to make sure that the pilot flame is large enough to completely engulf the thermocouple and keep it hot. If it's too small, you may need to take some compressed air and blow out the pilot hood to remove any blockage.

clean pilot light first , you may need to change thermopile or thermocouple see what mille volts you get from thermopile need 600mille volts

Hi there.
Try cleaning the thermopile, it must be free of soot or any form of dirt. Ensure that the gas pressure is sufficient, all wiring connections are tight and the hi limit is good.
If all of these are okay and the pilot still wont stay lit, try replacing the thermopile.
For Owner's manual download that will help you in minor fryer troubleshooting and reference, visit http://www.pitco.com
Regards.

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.

You have to check the following:
1. Does the pilot flame has the ability to heat up the thermopile? Themopile must be properly heated in order to generate voltage to open the pilot valve as well as main valve.
2. When the thermolpile is heated, does it generates 500 millivolts? If not, your thermopile needs replacement. If it does and still the pilot flame wont stay lit, your gas valve needs replacement.
3. Does the hi limit device has continuity on its terminals? If there is no continuity on hi limit terminals, you have to replace it. One of the thermopile wire passes on this hi limit terminal to cut the voltage supply on pilot valve in case the oil temperature reaches 450F.
4. Check and tighten all wiring connections, millivolts generated by thermopile will not pass on loosely terminated wiring.

if you changed the thermopile and still have the same problem make sure that the sensing bulb is directly over the flame. If it is and the thermopile is installed correctly the next thing would be the gas valve.

Hope this helps