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RUUD heater The heater will run for about 20 to 30 minutes then it will cycle on and off. The igniter lights every time. It turns on the gas but only stays on for about 5 seconds then shuts off. The fan comes on for about 2 minutes then the cycle starts all over again.

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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.

Posted on Jan 02, 2009

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When I turn the heater on, I here all the switches during cycle up but the gas never ignites. after a few minutes the furnace cycles down. The blower fan and AC work fine.


Make sure the pilot light is lit. if the pilot light is not lit I believe there is a safety switch that stops the flow of gas to prevent filling your home with it.

Mar 22, 2011 | Air Conditioners

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Hello, I have a Amana Air Command 80 model #GHI90A50, 22 years old. This furnace is on its third ingnition module (last one two yeras ago). The symptom I am trying to diagnose has been ongioing since this...


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.

Dec 05, 2010 | Air Conditioners

1 Answer

I have a RUUD Silhouette II and every once in a while the house gets cold and I check my furnace and the Status Light blinks-pauses-blinks-pauses ect. It is only flashes once so it tells me ''One Hour Time...


You will need to reset the furnace and have it run thru a cycle (or try). After three attempts, it will blink another error code that may tell you more.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Mar 03, 2010 | Ruud Matching Split Air Conditioner

1 Answer

Delayed ignition of a Ruud high efficiency upflow 90 plus propane


It sounds like the first thing to do is have burners and pilot cleaned and adjusted so ignitor and pilot flame is close to main burner ignition rail.

The "whoosh" is due to delayed ignition because the pilot flame does not come in contact with main gas.

One more thing that should be tested is the gas pressure and combustable air mixture to be sure it is correct.

It is always best to have a qualified technician do this for you, In many areas the gas supplier with check and safety test this for you.

Nov 24, 2009 | Ruud UBHC Air Conditioner

3 Answers

Ruud heater will not light consistently


Your furnace is going into a lockout condition, cycling the power resets the circuit board and it starts over. I will need to know approximate age and model of your furnace, it sounds like you have need to clean the flame sensor rod. However i need to know what i am working with.

Dec 18, 2008 | Ruud UBHC Air Conditioner

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 Air Conditioners

1 Answer

I replaced my Rheem Ruud 62-24084-82 Ignition Module Control Board in my Rheem gas furnace last year. Has worked great until last night. Now blower purge motor starts but does not go into ignitor cycle. ...


When the purge motor turns on, the controller is waiting for proof that it is running before ignition. On your model I think it a differential pressure switch and it should be in front of the furnace. Should be able to see a pressure or vacuum line running to. If it isnt there there may be a switch inside purge motor. If there is more than 2 wires running to the motor it probable is there. Anyway the controller is waiting for proof.

Nov 05, 2008 | Ruud Air Conditioners

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