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boweb6 11-24-2009 01:54 PM

flame carry over
Hello , trane xe 90 13 years old. Energize system, hear clicks at board area, blower starts and ignitor glows bright. First burner lights then shuts down. Repeat cycle and same thing. I am getting no flame carry over. Checked for exhaust blockage, adjusted pressure on gas valve cleaned furnace burners still does the same thing.

kb3ca 11-24-2009 02:28 PM

Bad or dirty flame sensor.

veesubotee 11-24-2009 02:57 PM

Check for a groove or channel below the front of the burners. Make sure it is free from crud. If the flame can't travel to the far end of the manifold, the flame sensor can't sense it. Flame out.


yuri 11-24-2009 04:16 PM

You adjusted the gas pressure? Did you use a manometer to check it? It may now be under or overfired and dangerous.

boweb6 12-02-2009 02:16 PM

I cleaned flame sensor and individual burners, the grove on the wing part. Put back together and worked perfect all night. thank you very much.

okrite 12-28-2009 08:08 PM

over and under-fire

Originally Posted by yuri (Post 357403)
You adjusted the gas pressure? Did you use a manometer to check it? It may now be under or overfired and dangerous.

Hi Yuri,

How much flame should should there be out the wings of the burner head (4) in a new Goodman? Deposits are forming on the Hx box between the [Hx tube entrance(s)]

The flue gas is different at 3.2"wc than 3.8"wc.....big difference in the temperature rise.

What are the consequences of under-firing the furnace?

happy 2010

yuri 12-28-2009 08:34 PM

How did you get those readings? with a professional or home made manometer? It should NEVER go over 3.5"WC. Did you install the unit yourself? If not get the installer to check it/set it up properly. Underfiring is NOT good as the smoke/gases can condense in the primary heat exchanger and damage it.

okrite 12-29-2009 08:23 PM

plugged condensate drain fitting, thumb's up?
A while back I worked for forty year Pro who did a de-rate on a Goodman like mine. He worked on the manifold and adjusted the valves, while I put in some filters and cleaned the ducts. He kept testing the flue gas and the temperature rise.

I did have a problem with mine however. Furnace kept quitting and was trying to restart. I thought I fried the board by running off a generator. It was a coincidence.

Fault codes said it is one of the following: pressure switch; blocked flue; blocked drain; weak blower; incorrect pressure switch setting, etc.

Main flue drain fitting was blocked and hoses had crud in them.

Measured the condensate discharge after cleaning. Putting out about ten pounds of water per therm, right?

Had nothing to do with the generator. Furnace had not been serviced for 3 years except for filters and some temp and air tuning.


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