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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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I have a goodman furnace, the ignitor glows gas lights and then burns only a short time and then goes out, this hapens 3 times then furnace cycles out and I get a blinking light,

Do you have Natural Gas, or LP Gas (Propane)
Do you have any other gas appliances?- like an oven?
Do you have gas at the other appliances?

The Ignitor getting bright, and cycling 3 times is a normal number of 'LIGHT' attempts -- and shows that you do have a good ignitor- That is important! and that is GOOD!

However-- it sounds like you have NO GAS.-- Is that possible?
If you do have gas in the kitchen, then either the manual Shut off valve is shut to this appliance, or the main gas valve is not opening --- for any of a number of reasons-

Tell us more about what you do have in other appliances.

Mack B

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I installed Goodman equipment in my new house, but i will be using propane for heat and the furnace gas valve is for natural gas. I have heard that there is retrofit kit to conver the valves to propane.

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