Question about Ruud UBHC Air Conditioner
Our gas furnace will act like it is going to light, but then it shuts itself off. We cleaned the ignitor, but it is still doing it. Once we get it running if we put the door back on it shuts down
I had that problem and it turned out the small exaust blower was froze up from a little rust in the bearing. I put some 3 in one oil on it and let it sit for a minute turned the blade with a screwdriver to make sure it was free spinning and turned on the heat again and it solved the problem.
Posted on Jul 04, 2012
I have 2 Ruud Achiever 90 Plus UGRK's. Units were install in 2004. One unit flames' out after ignition just prior to the fan kicking in. Confirmed gas value is functional by switching valves. Check wire connections. Could it be the remote sensor or another 24 volt sensor at the IFC that locks out the gas valve?
Posted on Apr 10, 2008
The door, you mean the metal cover on the front? if you have the door off and push the safety switch in with your hand everything works fine? I need more info here, but if what I said is right, then the "door" isn't making good contact with the switch.
Posted on Mar 05, 2008
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Posted on Jan 02, 2017
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Mar 01, 2015 | Ruud Heating & Cooling
Here is a tip that will help you try to figure out why your furnace is not working.
Basic Furnace or Heating System Troubleshooting
Dec 26, 2010 | Ruud Heating & Cooling
1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.
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