[atkinson23]

I have a Carrier furnace model 59TPA080E171116, about 3 years old. It works 80% of the time. The other 20% it gives a code 14 IGNITION LOCKOUT. It seems to stop working mostly when I'm at work in the morning and I get a phone call from my wife. When I get to it in the evening it is working. I've gone through the manual's troubleshooting trouble guide and haven't been able to resolve the problem. I've verified
-green/yellow wire is connected to furnace sheet metal
-flame sensor is not grounded
-igniter glows orange/white
-24 V (measured 26V) received across the gas valve. The guide doesn't say to replace the gas valve, but I've thought about it.
-Regarding the flame sensor, first I sanded it with light sand paper. When that did not fix the problem, I bought and installed a new flame sensor, exact OEM part. I have not measured the current through the flame sensor, but didn't think that could be the problem since it is a brand new flame sensor.

If I follow the troubleshooting guide, the next step is to replace the control board, but I don't want to spend $ if I don't have to.

Also, this fall I discovered my 2-year-old was putting landscape rock down the exhaust pipe. I cleared out all those rocks and added a 90 degree elbow and added a foot long pipe pointing straight down so my son cannot physically put a rock in that pipe. I am wondering if that extra foot of pipe pointing down is enough to cause a problem.

 

[pecmsg]

You've done as much as you can, Time to call for service.
BTW when was the last time that unit was serviced / inspected / maintained?

1 ell and a length of pipe "Shouldn't" effect the controls!

 

[HVAC_Marc]

Also, this fall I discovered my 2-year-old was putting landscape rock down the exhaust pipe. I cleared out all those rocks and added a 90 degree elbow and added a foot long pipe pointing straight down

It will lockout if the exhaust is being sucked back in and reburnt (2 pipe system). Exhaust gas recycling is one of the biggest problem makers and furnace killers.

 

[rider77]

I recently mentioned this in a prior thread.
I once had a conversation with a manufacturer rep who said upwards of 60% of control boards replaced were actually fine, and the problem was due to something else. As it's very easy to just blame a circuit board.
Point being, replace nothing unless your sure that it's the cause of the problem.
Unfortunately we cannot assist with diy repairs here.

 

[pacnw]

Also, this fall I discovered my 2-year-old was putting landscape rock down the exhaust pipe. I cleared out all those rocks and added a 90 degree elbow and added a foot long pipe pointing straight down so my son cannot physically put a rock in that pipe. I am wondering if that extra foot of pipe pointing down is enough to cause a problem.

Read your install manual to determine if this is correct. As HVAC_MARC stated, this MAY be causing an issue.

What are the conditions weather wise?

Can you post a photo of this?

 

[beenthere]

Sorry, our site rules prohibit us from giving DIY aid or advise.