I have three Dyna-Glo ventless NG hanging heaters. All in different buildings. Two work perfect but one lights as it should but after 2-5 minutes I hear a click and it goes out. I'm guessing the clicking I hear is the gas valve closing. All of them have oxygen sensors on them but this happens even if I have the garage doors open or closed. All of them have what I believe to be a flame sensor by the pilot light and without taking them apart to measure the sensor appear to be the same distance from the pilot light. It's frustrating to light the heater and come back a hour later thinking the garage will be warm only to find out the heater went out. Anybody ever worked on these or have any idea what I should look for. Thanks Gerald
- Thread starter gmccool
- Start date
1948CaseVAI
Well-known Member
That "flame sensor" in the pilot flame only shuts the gas off to the pilot if the pilot goes out. It is called a thermocouple and if you are not having trouble with the pilot going out it is OK.
You do have a real "flame sensor" that lives somewhere in the burner flame that shuts the gas off in case the burner does not light for some reason. It is a valuable safety feature but they do get dirty and when they fail they often exhibit the symptom you describe.
You can easily clean it with a dollar bill or, as my favorite HVAC guy does, you can use a $100 dollar bill to show off a bit. Of course no harm comes to the bill. Just wrap the bill around the sensor and gently rub. DO NOT USE SANDPAPER! The coating on the sensor is thin and sensitive but can be cleaned gently.
You do have a real "flame sensor" that lives somewhere in the burner flame that shuts the gas off in case the burner does not light for some reason. It is a valuable safety feature but they do get dirty and when they fail they often exhibit the symptom you describe.
You can easily clean it with a dollar bill or, as my favorite HVAC guy does, you can use a $100 dollar bill to show off a bit. Of course no harm comes to the bill. Just wrap the bill around the sensor and gently rub. DO NOT USE SANDPAPER! The coating on the sensor is thin and sensitive but can be cleaned gently.
Good Morning gm, Can you tell us the Model Number ?? Do you have or can you download an online manual which has troubleshooting ?? Is it a pilot light and thermocouple control or an electronic flame sense control unit ??
On the basic thermocouple types the TC often fails or is mis located while the later electronic flame sense heaters use an electronic control board which can fail grrrrrrr
Sorry more questions than answers
Best wishes G _ _ Bless
John T
On the basic thermocouple types the TC often fails or is mis located while the later electronic flame sense heaters use an electronic control board which can fail grrrrrrr
Sorry more questions than answers
Best wishes G _ _ Bless
John T
wore out
Well-known Member
Check the pilot burner closely, it's like a mini blowtorch aimed at the thermocouple. I've seen several instances where insect nests/debris have restricted air to the tiny burner causing a shorter flame that doesn't apply enough heat to the thermocouple.
On the other hand, if it goes out after the main burner is lit there could be an issue with restricted gas supply possibly caused by a pinched line or a failing regulator.
Would be helpful to monitor gas pressure (with a manometer) at the unit's gas valve before and after the main burner lights.
On the other hand, if it goes out after the main burner is lit there could be an issue with restricted gas supply possibly caused by a pinched line or a failing regulator.
Would be helpful to monitor gas pressure (with a manometer) at the unit's gas valve before and after the main burner lights.
WOW You guys are great!!!!!!!! I did notice that the pilot flame was a little shorter than on the other two heaters that I have. So upon closer inspection I found part of what was probably a bug or something in the pilot. I took it out and the heater works perfect. Thanks a bunch. Gerald
YAY! Simple fixes are the best! Similar threads
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