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RUUD ugde-12erajr 80Plus Ignites and gas is shut off after about 30 seconds.

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LOOK FOR A NEEDLE LOOKING PROBE ON LEFT SIDE OF BURNER ASSEMBLY. BE SURE ITS CLEN . YOU CAN CLEAN WITH A LITTLE STEEL WOOL OR SAND CLOTH. BE SURE WIRES ARE SNUG TO CONTROL BOARD. BE SURE ALL LOW VOLTAGE CONNECTIONS ARE SNUG AND A GOOD GROUND. IF IT STILL SHUTS DOWN THE BOARD IS PROBABLY BAD. I THINK ROBERTSAHAW MAKES A GENERIC REPLACEMENT FOR THESE.

Posted on Oct 27, 2008

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Ruud gas pack cuts off after a short heating session. Only can start by resetting rollout switch. What could be wrong?


burners could be rusted blocking gas from getting across , so it pockets up and ignites all at once ,there also could be a partial blockage in heat exchanger but this is unlikely, or more seriously the heatexchanger could be rusted out with large holes in it so when blower comes on the positive pressure pushes flame back. either way when the roll out switch is tripped it indicates a pretty serious and potentially harmful issue that should be inspected and diagnosed by a reputible company.

Dec 02, 2010 | Ruud UAMB Air Conditioner

1 Answer

Have a ruud achiever 90 plus furnace. the flame goes out after the igniter quits. any ideas


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


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.

Nov 26, 2010 | Ruud UBHC Air Conditioner

1 Answer

Hello, I have an achiever 90 plus ruud, when I turn it on the flame ignites but after 3 seconds it goes out, it does this 3 times than turns off. Help?


Are you saying that main burner is coming on or pilot /hot surface ignitor or spark ignitor ? If your induced draft motor is coming on then a few seconds later your main burner is coming on for 3 seconds and then shutting off but blower motor is not coming on I would look at flame sensor to make sure it is telling the fan motor to come on. Normally they will try three or four times and then lock out. One easy way to check blower motor is to set your thermostat to fan on. Fan motor should come on and run till you shut it off.hope this help you.

Nov 05, 2010 | Heating & Cooling

1 Answer

I HAVE A RUUD SILHOUETTE II GAS FURNACE. The glow rod glows bright, the fan whirrs for 30 seconds there is a click and nothing happens...the fan stops. No flame...nothing.??


this can be a few things. tonight, i fixed one with the same symptoms and it ended up being the gas valve was bad and the gas pressure on the outlet side was only 1 in water column on an LP furnace. That is one thing and would have to be checked with a manometer. The other is the board may not be sending 24volts to the gas valve telling it to open. hope this helps

Jan 05, 2010 | Ruud UBHC Air Conditioner

2 Answers

Gas furnace, main burner ignites the other 2 don't. then shutdn.


Between the burners is a small rail in the pressed steel where the flame runs across to light the other burners and it sounds like there is dirt or debris in the step over rails causing the problem. You will need to use some compressed air on those rails to clear them out. Once the rails are clear the other two burners should ignite right away.

Dec 21, 2009 | Heating & Cooling

1 Answer

RUUD heater


Sounds like a dirty flame sense rod. Be sure to shut off power before removing the rod and cleaning it with sandpaper or steel wool. Do not touch or disturb the hot surface ignitor or you may cause it to fail.

Dec 27, 2008 | Heating & Cooling

1 Answer

Ruud Achiver series Furnace issue


Sounds like it may be a bad flame sensor. After the ignition, the flame sensor needs to send 24v back to the gas valve to indicate the the ignition took place. If it does not do this, the gas will shut of as a safety precaution. The flame sensor can often be cleaned up with a piece of sandcloth to fix this problem, or it may be replaced.

Dec 14, 2008 | Ruud Heating & Cooling

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