Furnace kicking on..

[Charley L. Bottger]

[quote=dvalley]Yeah, it does have the troubleshooting blinking light on the board. The clueless HVAC tech told me that the blinking light is normal. I think the HVAC tech just played games with me and actually has no idea what the hell he's doing. Well, I'm selling my house this year anyways, so I think I'll leave it the way it is and advise or disclose to the Buyers about this situation.

quote]

David if I was sitting in front of your furnace instead of this dumb computer from what you stated that it only kicks off during an extended run time trying to catch up I would first be looking at a limit switch as the guilty party or possibly the roll out switch.

The blinking lights will normally tell you what device failed if you can decipher the codes but you have to observe the configuration of blinking lights before you kill the power to the unit and reset the board.

[rfarnum]

Originally Posted by rcooke

Question when was the last time you had your furnace serviced .
We always tell our client to get the furnace serviced and then we try and do our own.

Roy Cooke A happy NACHI Member

Isn't ones own advice hard to swallow... How often have I said, get your furnace serviced regularly...
I'll see if I have to call in the morning, I cleaned the flame sensor as was suggested and it was working today when I got home. We'll see what it is when I wake up in the morning.

Thanks,
randy

[David P. Valley]

Thanks Charley and Darrel,

This dilemma only occurs during the freezing temperatures of 10 degrees and below. The furnace is operating absolutely fine within the last few days.

This is what I'll do....I'll wait until this auto shut-down occurs again (when the weather gets below 10 degrees).

I will then open the front cover and observe the light pattern. Then I'll post here (I'll be saving this post) as to the light sequence and we'll take it from there. There's not much I can do until this furnace starts to act up again. I want it to occur naturally verses forcing it to occur, so I can observe the lighting sequence.

This furnace is a 1998 horizontally installed direct vented Concord 80+. It's installed in a vented closet in my finished attic and receives plenty of combustion air, as the closet attic cavity contains soffit vents, ridge vents, and louvered vents on the side of the sheathed wall.

Let's wait for colder weather I'll continue posting here.


Randolph,

Good luck with your issue of re-setting the thermostat. I hope the flame senser was your problem.

Fill us in.

[David A. Andersen]

Just as an additional thought about why this stuff happens when it's subfreezing, if the unit is not exposed to the low temperatures then look to what is.

Gas supply line?

Are we condensing moisture in the gas supply?

As I think Charlie said, you can't tell anything from here!
When all else fails, change your thinking.
You need an HVAC technician that systematically diagnoses what is occurring, not a parts changer!

[David P. Valley]

Originally Posted by dandersen

You need an HVAC technician that systematically diagnoses what is occurring, not a parts changer!

Trust me, I've had three different HVAC companies over my house to diagnose this continuous problem. Not one HVAC tech (not a parts changer) has figured it out yet. I simply pay them their maintenance and cleaning fee and cross them off my HVAC contact list as being unprofessional.

Maybe the fourth HVAC tech will figure it out. We'll see.

[rfarnum]

After cleaning the flame sensor it has worked correctly, but now I am thinking about David's delima and wondering if it will happen when the weather gets below zero again. It has warmed up, all the way to the low teens and the problem happened in the sub-zero weather.

David, please let us know if you discover anything when it gets super cold again, I will do the same. I have talked to a couple of HVAC guys and they are waiting for the cold to come back to see what happens.

Thanks for all the imput,
Randy

[David P. Valley]

Originally Posted by rfarnum

After cleaning the flame sensor it has worked correctly, but now I am thinking about David's delima and wondering if it will happen when the weather gets below zero again. It has warmed up, all the way to the low teens and the problem happened in the sub-zero weather.

David, please let us know if you discover anything when it gets super cold again, I will do the same. I have talked to a couple of HVAC guys and they are waiting for the cold to come back to see what happens.

Thanks for all the imput,
Randy

I will save this thread and wait for this to happen again. My furnace is absolutely fine now.