Question about Ruud UAKA030 Air Conditioner

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Furance I have 2 Ruud Achiever 90 Plus gas furnaces. Units were installed in 2004. One unit flames out after ignition and just prior to the fan kicking in. Confirmed gas valve is functional by switching out valves. Check all wire connections. Could it be the remote sensor or another 24 volt sensor at the IFC that is locking out the gas valve?

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There should be a flame rod that senses the flame , if not will shut off gas valve. It is a stainless steel rod that is in the flame path and wires into the panel ground. You might try to clean it with some steel wool or fine paper. Sometimes they will act up with just a little ash or sulphur deposit, even may look clean.

Posted on May 31, 2008

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How to clean clogged condensate drain of ruud furnace achiever 90 plus


You can easily blow through the drain with pressurized air through the p trap. There could be a number of reasons the furnace side is not working. In the case of windy conditions there is a possibility that your pilot will need to be adjusted or the flame sensing rod might need to be cleaned. If the pilot wavers off of the sensing rod it could cut off the heating cycle because the system could not verify a flame yo bring on the main gas valve to continue with the cycle

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I have a Rudd Achiever 90 plus Premium Efficiency Model# UGRA09EZAJS Serial# Y5D707F460504955 mfd date 11/2005, It blow a cold air after turn the heat on and set it on position instead of auto, temp set...


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Sounds like it could be a dirty or bad flame sensor.
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The flame sensor looks like a wire and it's in the flame usually it will get gas deposits on it, then it won't work.
You can clean this sensor with an extra fine piece of steel wool, but before you attempt to do this DISCONNECT ALL POWER TO THE FURNACE.

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In that case, clean the coils and have refridgerant added.

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