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M Oglesby
M Oglesby, HVAC Technician
Category: HVAC
Satisfied Customers: 2038
Experience:  Universally Certified HVACR Technician
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My furnace keeps faulting out it says ignition lockout due

Customer Question

My furnace keeps faulting out it says ignition lockout due to retries what does this mean and what would i due to fix it
Submitted: 3 years ago.
Category: HVAC
Expert:  M Oglesby replied 3 years ago.

M Oglesby :

Hello I am here to assist you.

Customer :

hello

Customer :

would this be the result of a dirty flame sensor

M Oglesby :

Yes

M Oglesby :

The flame sensor needs to be cleaned with a piece of emery cloth or sandpaper.

Customer :

is that about the only thing i should try

M Oglesby :

That is the only thing that it could be unless your control board is bad.

Customer :

ok thanks and i will try that everything else on the furnace seems to be in proper working order this problem just occured over night

M Oglesby :

But I am pretty sure that is the problem

Customer :

ok thank you

M Oglesby :

Please hit ACCEPT if you are satisfied with this answer.

M Oglesby :

You are welcome.

Customer :

one more question the flame sensor should be two wires attached and on the side of the burner right

M Oglesby :

The flame sensor should have only one wire and is located in the path of the burner jets.

M Oglesby :

The igniter has two wires.

Customer :

ok my burner has two elements on each side and they both have two wires going to them both

Customer :

that is all i see on that box

M Oglesby :

Describe to me how the elements look?

Customer :

it is a coleman furnace if that makes a difference

M Oglesby :

The flame sensor rod is a small thin steel rod that is straight or L shaped.

Customer :

they have two prongs on them with electric connectors hooked to them

Customer :

ok

Customer :

i will have to pull this and see if it is the rod you are speaking of

M Oglesby :

ok

Customer :

yea you were right deff not the flame sensor i guess my next question would be would you be able to tell me were the flame sensor is

M Oglesby :

It is usually located near the pilot igniter or in the path of one of the burner jets.

M Oglesby :

Locate it and let me know if you find it.

Customer :

I have a small box about 10wX6dX4t it has a sight glass were you can see the pilot come on but the only wires attached to it are on the left and right side of the box both of these have two wires going to them same color wires at that and these when un screwed from the box they are just flat little round plugs,

M Oglesby :

ok give me a few minutes.

M Oglesby :

I advise you to call a technician out to clean the flame sensor for you.

M Oglesby :

Have a good day.

Customer :

ok I found that flame sensor took it out and used some emory paper and cleaned it put it back in reset the fault and fired it up and im still gettin the same fault ignition lockout

Customer :

the flame sensor is in good lookin shape it had a very little amount of debris on it

M Oglesby :

You have to scrub it very very good.

M Oglesby :

That was quick.

Customer :

so even if it looks clean it still might need some more scrubbin

M Oglesby :

That is correct.

M Oglesby :

Especially on the tip of it.

Customer :

yea it was kinda hidden but it was right on top of that box all the way to the back

Customer :

should i be worried about cleaning it to much or give it a good scrubbin

M Oglesby :

Give it a good scrubbin.

Customer :

see i didnt concentrate so much on the tip ill try it again

M Oglesby :

If cleaning it does not correct your problem, you will have to call a technician.

M Oglesby :

Please hit ACCEPT if you are satisfied with this answer. If not, do not hit ACCEPT.

Customer :

yea that didnt do the trick and it is clean looks brand new, otherwise you think it was what?

Customer :

I have a tech on the way

Customer :

he will be out in a couple hours

Customer :

you think it could be that board

M Oglesby :

I apologize that we could not solve your issue.

M Oglesby :

Do the burners ignite at all?

Customer :

yea the burner ignites but it kicks back off it does that three times and then faults out

M Oglesby :

It could be a number of things.

M Oglesby :

It could be a loose or broken ground wire some where

M Oglesby :

Or it could be the control board is gone bad.

Customer :

o ok

Customer :

those control boards are proably pretty exspensive

M Oglesby :

The control board it self will cost about $175.

M Oglesby :

The labor will be another $200

Customer :

the other thing i noticed is usually when i had this problem i would throw my thermostat on and off and it would work great

M Oglesby :

Well whatever it is hopefully the tech will find it.

Customer :

well thank you hopefully he does im in mich we still have snow lol thanks alot

M Oglesby :

YOu are welcome!

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