SOURCE: i have a Ruud Achiever 90 plus furnace that will not ignite
Again is this a spark or a glow coil? If it is a glow coil look at the coil and see if there is a crack or white spot on it. If so it needs to be replaced.
SOURCE: How do you change the air filter on a Ruud silhouette II furnace?
If it is a down flow, it will usually be found in the return air plenum just above the blower. You need to remove the front panels and look inside above the blower. You may need to remove a second door to access the blower section. If it is an upflow, remove the bottom door and look alongside the blower where the return air comes in.
SOURCE: 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.
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SOURCE: Ruud Silhouette II Gas Furnace, the furnace lights
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).
SOURCE: How do I clean the flame sensor rod for a Ruud
a dollar bill works well for cleaning flame sensors, too
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