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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. On board power light is ON(AN1)but green light next to it (AN2) is intermittently going on and off. I am trying to determine cause of malfunction.

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  • 1dandy1 Nov 05, 2008

    Need more information on how to test and how to jumper wires to verify part is bad. This part looks like a distributor vacuum advance module only it is a switch with several wires.

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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.

Posted on Nov 05, 2008

  • butch welch Nov 05, 2008

    Do you know what a single pole douple switch is. I believe before you start jumping wires I would check the line going to the control. Can you tell me if its on the pressure or vacuum side of the fan or both. Is there plenty of air coming from the fan..If you have to jump it, jump the common and the n.o.

  • butch welch Nov 05, 2008

    You have found the right part. Before you start jumping wires make sure the line going to it is good. The fittings or connections have to be airtight, no crimps, or breaks. Can you determine if its pressure or vacuum or both. Make sure you have plenty of air coming from the fan. If you have to jump it will be the common (C) to the N.O. I would take the line off and blow it out..

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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

2 Rheem Protech 500 thermostats, 1 upstair & 1 downstairs with a Rudd Achiever 90Plus gas furnace. Thermostat downstairs works fine but upstairs one cycles fan on and off 2-3 times during heating...


Have you checked to make sure that all of the supply registers are open, the air filter is clean and nothing is blocking the return air grill?
It almost sounds like you could be cycling on a limit switch.
Usually on gas furnaces, the blower is controled by the onboard controls, in the cooling mode the thermostat will control the blower.
I would be looking past the thermostat, at the furnace it self.
I hope you find this helpful. If you continue to experience problems, please let us know and we will dig deeper. :)
Paul

Feb 13, 2010 | Ruud UBHC Air Conditioner

3 Answers

Ruud Silhouette II Gas Furnace, the furnace lights but will only stay on for a few seconds?? What could be the problem??


Bad or dirty flame rod.
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).

Jan 09, 2010 | Ruud Heating & Cooling

1 Answer

Have a 87' Ruud furnace, was working last night & now nothing works. I replaced the thermostat & the pilot is on, however the fan with not run & the main burner will not start. (the breaker on...


I believe these furnaces still used a fan/limit control. The fan will not come on until the heat exchanger is hot enough. Your problem most likely lies with the burner not lighting. Make sure the fan/limit control dial has turned back all the way to the correct temp, if not, replace it. The fan/limit control is inside the aluminum cover in the middle of the burner section. Also, the gas valve may be bad. See if you have 24vac at the gas valve during a call for heat. If you do and it's not opening.......bad gas valve.

Oct 06, 2009 | Heating & Cooling

1 Answer

Power outage last night now my RUUD High Achiever AC Unit model# UPNE-048JAZ will not work


Power surge may have taken out your control board (in the furnace, does the fan work?), possibly the transformer (in the furnace) or possibly the capacitor (in the A/C). Call a professional.

Aug 22, 2009 | Heating & Cooling

4 Answers

Ruud furnace won't stay lit.


Hi, welcome to Fixya. If you have spark ignition turn off the power and using sand cloth clean the rod(s) and hood of the spark ignition. If it is a Hot Surface Igniter (glow coil) look on the opposite end of the burners and you will see a rod protruding in to the flame. It's called a flame sensor. Clean it with the sanding cloth. If either of these works then you bought some time but should consider replacing the part fairly soon. Please report back to let us know your progress. Good luck.

Jan 25, 2009 | Ruud Central System Air Conditioner

1 Answer

(HVAC) Furnace Not Igniting Quickly


Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.

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1 Answer

Rheem gas furnace pilot lights, but no burners or fan


If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

Jan 06, 2009 | Heating & Cooling

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