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GKS91155DXAD Not finishing cycle

I'm building a new home and we just installed had a goodman 4ton ac and natural gas furnace model#GKS91155DXAD installed and first three days worked great. Then would run cycle and start fine but would burners would shut off before thermostat statisfied. Then igniter would light burners after about 2 or 3 times but burner would only stay on for about 30 secs. to 1 minute. blower would stay on through whole process. But never satisfie thermostat. It has never flashed a code. We have changed the board out and the flame sensor. Help we are lost!!!

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Check the heat anticipator setting on the thermostat if its a mercury type thermostat. It may not match the proper amp draw. Take the cover off and it is a little metal lever. Try different adjustments to see which are better. If its a digital thermostat it may have an internal setting. There are several other possible reasons this could happen but that would be the most likely. for more infor on self diagnosis or the like check out my fave website Ra-Jac Air Conditioners and Heaters TX for repair information.

PS: If its a new installation it should have a one year warantee so call back the person who put it in. If you did it yourself be extremely careful gas furnaces can be dangerous. You might want a service person to check the job out for safety hazards. Good Luck with it.

Posted on Feb 29, 2008

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