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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.
there are 3 phillips head screws on the bottom of heat exchanger and wre the burner assy. meet and 3 wing nuts on the bottom back remove and disconnect the gas line and the wires to valve and remove the assy. easy to remove thermocouple from this point install in reverse order, may need to adjust the pilot flame down on the gas valve if the pressure is causing the thermocouples are burning out.
Thermocoupler is dirty or needs replaced. The thermocoupler is the copper looking tube that runs along the pilot tube. The flame has to hit the thermocoupler to generate milivolts to open the gas valve
how by extending the duct work will it make the gas valve work ?
if the pilotkeeps going out clean pilot jet , or if the power unit has gone in the gas valve then you would have to change the valve , don't get the flue bit ?
The "wire" you broke is probably the tube for the pilot assembly. It supplies gas to the pilot which in turn fires the burners thru a gas valve. The other option is you broke the thermocouple which causes the gas valve to open (its a safety feature incorporated to keep gas explosions from happening). You will need to replace the broken part before using this unit--period. It is not worth the danger involved trying to bypass these safety measures. BE SAFE!!!
I can help with part of this problem. The thermocouple is a sensor right next to the pilot flame. When heated by the pilot flame, it generates a small voltage. This voltage opens a small valve and feeds gas to the pilot. If the pilot light should go out, the thermocouple stops generating voltage. This causes the gas valve supplying gas to the pilot to shut off. I oversimplied the way it works. If this does not make sense. Google how a thermocouple works.
Make sure the gas valve is turned to the "On" position after the pilot stays lit. You may need to replace the thermopile. Some units have a thermopile rather than a thermocouple and it will not allow the gas valve to open if not enough voltage is being sent to the gas valve. Hopefully your gas valve is working properly and will not need to be replaced.
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