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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 is a coleman evcon model 7995C856. The problem is

Customer Question

MY furnace is a coleman evcon model 7995C856. The problem is the burner won't stay lit after the furnace calls for heat. The pilot light and the burner both go out after about 30 seconds. It looks like the flame is being blown out by the combustion fan. This is before the circulating fan comes on.
Submitted: 3 years ago.
Category: HVAC
Expert:  M Oglesby replied 3 years ago.

M Oglesby :

Lets hope that is not true because if the pilot is being blown out by the fan, that means you have a cracked heat exchanger and that is a very expensive job.

M Oglesby :

It sounds like it could be a flame sensor issue.

M Oglesby :

The flame sensor Rod is a small thin steel rod that is straight or L shaped. It is usually located near the pilot igniter or the outside corners of the burner tray.

M Oglesby :

Locate it, remove it, and clean it very good with a piece of sandpaper.

M Oglesby :

Please hit ACCEPT if this does the trick. If not, I will continue to assist you. Bonuses and positive feedback are greatly appreciated!!!

Customer :

I don't think my burner has a flame sensor. I just had the whole burner out. Its a long tube with flutes on the end. The burner control valve just bolts up to the burner and the gas jet shoots gas into the burner tube which is ignited at the end by the standing pilot with the thermocouple over it. The heat exchanger is fine, the flame goes out with just the combustion fan running before the main fan turns on. I was wondering if it could be starving for gas i.e. the control valve is faulty. Do these valves get dirty or plugged and should I start with a new one there first. I am convinced the burner, heat exchanger are all fine, I checked them over pretty good. Any input you have would be appreciated. Thanks

M Oglesby :

The thermocouple is the flame sensor! Clean the Thermocouple with a piece

M Oglesby :

Clean the thermocouple with a piece of sandpaper.

Customer :

In the original question I stated that I had changed the thermocouple! The problem ended up being that the control valve was starving for gas, the pressure reg. had ice in it.

M Oglesby, HVAC Technician
Category: HVAC
Satisfied Customers: 2038
Experience: Universally Certified HVACR Technician
M Oglesby and 3 other HVAC Specialists are ready to help you
Expert:  M Oglesby replied 3 years ago.
I apologize for not solving your issue but thanks for the info. I was trying my best.

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