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Replaced cracked heat exchanger on Goodman gas furnace( model# GMPN060-3) main limit trips constantly. Temperature at limit reaches up to 250 degrees. Downflow application, clean evap. coil and no return air restrictions, HELP

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It may help if you increased the blower speed. It sounds like you have a restriction in either the return air duct or in the heat exchanger. Does it help to open the blower door panel. If so, you have confirmed a restriction. How do the burners look? Are they good and blue or yellow? Are the correct orifices being used for the type of gas? I know I am asking more questions than you, but it may help us with the answers. Good luck to you Wade.

Posted on Jan 31, 2010

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Check for proper temp rise do you have any restrictions in supply or return is your filter clean. the temp you described is way to much as cheap as goodman units are may be be better to replace the whole unit i have replaced those heat exchangers before never again . it far more easier to replace the unit.

Posted on Jan 31, 2010

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Goodman dependable 92,7years old. Furnace works sometimes. Checked out by qualified technican. no problem found. Constant checks shows troubleshooting light blinks three (3) times. Help please. 3...


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1 Answer

I have an early 80's mobile home with an "intertherm gas atmospheric furnace" pilot light is lit but can't get the furnace to "fire". Seems as though the limit control is stuck open. ...


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1 Answer

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It sounds like your furnace is cycling off because your high temperature limit is tripping. This could be caused by a restriction of intake or outlet airflow. First thing to check is your intake air filter, clean or replace as needed. If that doesn't help, make sure your warm air registers are open, a rule of thumb is at least 60% of the total registers need to be open for adequate airflow. The high temp limits will reset themselves after they cool so that would explain it taking a few "cycles" to reach desired temperature. Good luck and please rate my answer if it was helpful.  

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1 Answer

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1 Answer

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1 Answer

Goodman furnace went out. Light blinks four times


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Check your furnace filter and any return air ducts in your home - see if they are blocked or restricted.

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