Question about Carrier Weathermaker 8000 Gas Furnace 125k Btu

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Weathermaker 8000 not enough heat

I have a Weathermaker 8000 double speed furnace, The furnace is working, I can see the flames, the fan is blowing air. But the heat is not enough to warm the rooms. The thermostat is always showing 20 degrees, does not matter if I setup to 25. Somebody can help me? Thanks.

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Are the tips of the flame blue? You might need to adjust the air mixture sleeve on the burner.

Posted on Jan 29, 2014

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Posted on Jan 02, 2017

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SOURCE: weathermaker 8000 58tua stops frequently

Removing the front cover or turning the line switch off and back on causes a "HARD" reset to the furnace. That means, it breaks the line or supply voltage to the furnace and causes the main control board to reset. The main reason for requiring a hard reset is a failure to fire up correctly. There are several reasons for this to happen. If or when the flame sensor detects a flame determines the whole process. When the thermostat calls for heat, the ignition controller delivers spark to the pilot assembly and the pilot gas valve opens. If the sensor detects a pilot flame, the main gas valve opens and the main burners ignite. The pilot flame can be pulled away from the sensor when the main gas opens just long enough to cause this type of failure before the main flame is sensed. The furnace will shut down thinking it is feeding in raw gas with no pilot present to ignite it. All of this happens in just a few seconds. If there is a small window in the burner cover, you can watch it fire after the reset for a clue to the cause. If there is not an inspection window with a sealed combustion chamber to watch it through, it would be best to call a good tech. as it is dangerous with such a short period to ignite while all that gas is flooding the combustion chamber. Check to see if the line from the pilot to the gas valve is tight. If possible, try to move the sensor a little closer to the pilot. If this does not work, best to call a tech. who is familiar with your furnace. Other test with an open combustion chamber are very dangerous and best left to the pros.

Posted on Dec 17, 2013

Testimonial: "Thanks a lot, Roger! When you talk about sensor, do you mean flame sensor."

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1 Answer

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After 18 years of service, it is not cost effective to just replace the heat exchanger. Go the complete replacement route. There may be a utility company incentive to do it.

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1 Answer

Weathermaker 8000 58tua stops frequently


Removing the front cover or turning the line switch off and back on causes a "HARD" reset to the furnace. That means, it breaks the line or supply voltage to the furnace and causes the main control board to reset. The main reason for requiring a hard reset is a failure to fire up correctly. There are several reasons for this to happen. If or when the flame sensor detects a flame determines the whole process. When the thermostat calls for heat, the ignition controller delivers spark to the pilot assembly and the pilot gas valve opens. If the sensor detects a pilot flame, the main gas valve opens and the main burners ignite. The pilot flame can be pulled away from the sensor when the main gas opens just long enough to cause this type of failure before the main flame is sensed. The furnace will shut down thinking it is feeding in raw gas with no pilot present to ignite it. All of this happens in just a few seconds. If there is a small window in the burner cover, you can watch it fire after the reset for a clue to the cause. If there is not an inspection window with a sealed combustion chamber to watch it through, it would be best to call a good tech. as it is dangerous with such a short period to ignite while all that gas is flooding the combustion chamber. Check to see if the line from the pilot to the gas valve is tight. If possible, try to move the sensor a little closer to the pilot. If this does not work, best to call a tech. who is familiar with your furnace. Other test with an open combustion chamber are very dangerous and best left to the pros.

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If it works with blower door off sounds like it's not getting enough return. What's the statics? Try an adjustable limit, I think they go to 210. Good Luck!!

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

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