Gas Furnace People

[MadReefer]

I have this situation with my furnace that it tries to light but goes out and constantly does this. The only way I have been able to correct this is by shutting it off for 10 or 15 minutes and leaving the cover with airflow off. Once I start it up works fine and then a few hours later I can put the cover back, Any ideas what the issue is?

Thanks
Mark

 

[jose102173]

I have this situation with my furnace that it tries to light but goes out and constantly does this. The only way I have been able to correct this is by shutting it off for 10 or 15 minutes and leaving the cover with airflow off. Once I start it up works fine and then a few hours later I can put the cover back, Any ideas what the issue is?

Thanks
Mark

Gas or oil fired

 

[Trio91]

do you have a Gas or Oil furnace?

you can try this i have picked up some tips in the past....there is a series of videos on this channel
Introduction to Grayfurnaceman's channel - YouTube

 

[jose102173]

I see the title gas furnace

 

[Trio91]

sorry i didnt read the thread....i have never dealt with an gas furnace...sorry about that

i do have a contractor that services mine and he he's really inexpensive

 

[mikem]

most likely the controller. The part with the blinking green light.

 

[mikem]

Also while you're in there, see if the blower spins freely and see if there's a little oilier spot on it.

 

[jose102173]

It could be your limit or flame sensor

 

[redfishbluefish]

Hard to diagnose without seeing in person, but the first thing I'd be looking at is the thermocouple. It is the most common reason a pilot light won't stay lit. The cost of the part is between 10 - 25 dollars. Relatively easy to replace. An adjustable wrench and some busted knuckles should do it.

 

[MadReefer]

Thanks everyone for the input. there is no green blinking light to my knowledge unless its in the bottom half of the unit. Paul, no clue what you're talking about....LOL
Forgot to mention this did happen about 3 years ago and $150 bucks later some sensor was replaced.

 

[redfishbluefish]

Video: Replacing a Furnace Thermocouple

 

[jose102173]

Without seeing the unit it is difficult to diagnose. Your unit might not even have a thermocouple could be spark ignition, if so could be the flame sensor

 

[mikem]

^ This is most likely the problem. You might not see the green light because the sensor is shot. I just had a sensor replaced in a customers house for about the $150 you said. It was doing the exact thing your's does.

 

[MadReefer]

Thanks all for the responses. I still don't see anything with a green light and never have. Also, I have don't see that copper coil. I posted two pics that I hope helps.

 

[Brando457]

When is last time cleaned the air filter?

 

[jose102173]

The green light is in the lower portion of the furnace on the control module. As far as the copper coil/thermocouple you don't have one. You have a flame sensor located in one of the burner tubes. They usually get carbon build up, which you can clean with some sandpaper.

 

[MadReefer]

Replaced air filter last month. I know the ceramic piece you're referring to and have cleaned that as well with emery cloth.