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How long is the pilot flame? It could be you can move the thermocouple into the flame by making adjustments of the metal holder. If the flame is small, there is an adjustment for the piolet flow in the control module where you turn gas on and off and light the pilot. It should be labeled and usually has a cover that must be unscrewed to reveal the adjusting screw. Need a bright flash light to see what you're doing.
check to make sure that the poilet lite flame is touching the tip or top of the thermocouple. the pilot lite needs to heat up the thermocouple so that the thermocouple opens the gas to the main gas log. a cold thermocouple shuts off the gas to the main gas log or gas burner and a hot thermocouple opens the gas to the main burner. the pilot lite flame must be touching the thermocouple to heat it up. pilot lite orface needs to be clear to let the pilot flame gas through with enough pressure so that the little flame can reach & touch the thermocouple. Pilot lite gas feed tube must be clear to let gas through. Use compressed air or a fine sewing needle, or even carb cleaner to clear out orface hole and gas feed line to pilot lite.
important!! WARNING: if you use carb cleaner,make sure all the carb cleaner is dry,soaked up with paper towell or kleanex tissue and blowed out with compressed air , because carb cleaner can burn just like gasoline; so any carb cleaner must be compleatly gone before you attempt to lite the pilot lite.
sound like pilot lite is not getting thermocouple hot. check that pilot lite flame is extending out to and touching thermocouple. If not, clean out pilot lite orface and pilot lite gas feed pipe all the way back to the main gas valve if necessary. If pilot lite flame is touching thermocouple, then replace thermocouple
does the pilot go out when you let off the button? Or does the pilot not light at all?
If you dont get any gas at all to the pilot the the gas valve is bad. Of you get a pilot light that goes out when you let go of the button then the therno couple is not reading the flame (needs adjustment so the pilot flame touches it) did you kink the new thermocouple? or over tighten it at the gas valve. if it was kinked its now toast,cant straighten them. If kinked and starightened the fluid inside has broken the inner seal and wont work.
You can't adjust the Thermocouple into the flame. But, you can clean the pilot assembly, so that the pilot flame doesn't curl (curve upward away from the thermocouple).
Turn off the heater: Use canned compressed air with a straw nozzle (like you clean your computer with). Place the tip of the straw nozzle into the pilot tip and give it a quick shot of air. Look down the pilot from the tip and about 2/3rds of the way down, you'll see a whole in the side of the pilot. That's the ODS Sensor. Place the tip of the straw nozzle just barely into that hole and give it a quick blast of air. You'll probably see debris blow out the other side. Light the pilot, but not the burner. Is the pilot flame straight and now touching the thermocouple? If not, re-clean the pilot assembly.
I think you need to reposition the thermocouple, or adjust the pilot gas pressure by adjusting the pilot screw make sure it is still the recommended gas pressure of the system... please contact a HVAC tech if this things did not work.
The pilot light is working so you know you have gas but you also know that the gas is not coming on. The pilot flame should be bright blue with the tip of the flame having a ting of yellow. A yellow flame is caused by a dirty pilot tube tip. Split flame is caused by dirt in the pilot tube. If the flame is not hot enough it will not tell the thermocoupler to turn the gas on. If the thermostat has not been moved and is still at the correct setting then I would suspect the thermocouple is bad. The thermocouple is mounted right next to the pilot light. It senses if the flame is hot enough for the gas to come on. If the pilot flame is not touching the coupler then it will not allow the gas to be turned on to the burner. Check the thermocoupler and see if the flame is touching the probe on the end. If not adjust it until the pilot flame is touching the coupler. If the flame is properly adjusted then replace the thermocoupler but shut off the gas supply before doing so. It will look like this.
The thermocoupler is faulty. It is that bulb that sits i the pilot flame. It controls the gas valve so you won't get any gas if the pilot goes out.. So, the thermocoupler needs to be replaced. Inexpensive and easy fix. Good Luck _Ned_
The thermocoupler is bad.Replace it,or if you can adjust it to where the thermocoupler is in the pilot flame.You know you have to hold the knob down for about 30 seconds or a minute,don`t you?If the flame will not touch the thermocoupler,it will not stay lit.You can cut a piece of copper tubing,or steel tubing to slidde over the old thermocoupler to make contact with the pilot flame,and it will work,if the thermocoupler is not in to bad of shape.