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Ruud achiever 90 plus gas furnace not blowing any heat

Any ideas? There is air blowing through the vents, but it isn't hot!! Please help!!

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  • kim_wilborn2 Mar 20, 2009

    My furnace pilet light is lite, but will not kick on for heat to come out. Fan works and everything else. What can be wrong? Please help im a single mother of 4 kids and very low income.

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These new furnaces are trouble. Ive been in the htg trade for 25 yrs. The fan is running because they are now controlled by a timer instead of a temperature control. Rather than sensing a preset temperature and turning on the fan, it comes on by a preset time. Couple of things, does either of the doors have an inspection window? most newer furnaces have what is called a smart board. The board will flash a trouble code. ie: 1 long 2 short etc. #1 turn your thermostat to off, youll need 2 people for this! Go to the furnace, If it has the above mentioned inspection window ( usually about 2" round) while peering through the window have someone turn the thermostat to about 80 degrees. Let the furnace cycle and see if it flashes a code. If it does the codes are usually on the bottom door, May be on the inside. The most common cause is either a bad transformer, bad hot surface ignitor or pressure switch failure. Further questions feel free to ask. Steve

Posted on Dec 21, 2008

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