Coleman 7900 - Burner problem? Clicks on and off

[todd_s]

I have a 7900 series, Coleman, 1986.

My burner will not stay on for extended period of time, it clicks off and on. I have no idea where this Heat sensor is, if this furnace even has this one. I keep being told that it might be that, but I haven't a clue where it is located.

[Robert]

Check your burner tube and burner orifice/spud behind the gas valve for blockages (spider-web-bugs).


Thanks,
Robert

[todd_s]

This is the burner tube, correct? I have cleaned this.

[Robert]

No, burner tube or burner venturi is behind gas valve and is where burner flame comes from.

May be best to call an hvac tech to resolve this issue.


Thanks,
Robert

[todd_s]

Do you have an idea how much it would cost for something like that? Just a ballpark?

Thanks..

[Robert]

Depends on who you call. Charges vary widely from one company to the next.

IF I came out and it was ONLY a dirty/clogged burner and/or burner orifice, it would be $75.00 .


Thanks,
Robert

[todd_s]

I've tried everything. Could it be the burner limit switch? That's the only thing I can think of.

or any of the switches?

[Robert]

Yes, an intermittent problem with limit switch could cause this problem. Test them to see if they are opening.



Thanks,
Robert