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Ruud Furnace won't turn on

I have a Ruud Achiever 90 Plus Premium Efficiency Furnace that is only a few years old.  When I turn up the thermostat the furnace will start up but shut off  within a few moments.  The led light, which reads OK, will blink twice then stop, blink twice then stop over and over.  The Flame light will not go on.  Any ideas what could be wrong.  Any help is greatly appreciated.  Thank you.

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Re: Ruud Furnace won't turn on

Take of the access panel on the furnace and look for a wiring diagram either on the back of the panel or inside the housing. There will be a diagnostic chart on it that will give you a hint what 2 flashes mean. I think it is a "no Ignition" code. If it is, with the access panel off and the door switch taped in the closed position, the furnace will try to start if the thermostat is calling. You want to look at the control module to see if it is flashing, then you should notice a small fan that pushes out the combustion products start to turn. Then if you look in a small view port, you should see an orange glow followed by a clicking noise at the gas valve. Then you should notice a blue flame in the view port. This flame must stay on for 5-6 seconds or the unit will turn it self off. If one of these do not happen, you will need a technician to troubleshoot it. Check to see if all wires and hoses are tight and in place. Make sure your condensate hoses are not blocked and free of water. Make sure there is no blockage in your vent pipe(s). 


Let us know what you found. 

Posted on Oct 12, 2007

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Re: Ruud Furnace won't turn on

Upon further evaluation of the valve clicking problem, I discovered that when the drain pipe (leader) is disconnected from the induced draft fan outlet, the clicking is less frequent and the gas flame is more stable. Also, from this condensate drain (that is connected to the pipe that leads to the ejection pump sump) very little water comes out.. and a steady exhaust gas blows out of it. I also noticed that in the main PVC exhaust pipe leading to the outside of the house, water sounds can be heard.. Is what I describe normal? Should gas fumes be going into the house through the condensate drain?. Appreciate any help I can get. Thanks.

Posted on Nov 23, 2008

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