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If furnace is not coming on, there should be an error light flashing on the control board in blower compartment to indicate what has failed. If you can locate this and tell me the pattern of the flash, that will point us in the right direction for troubleshooting.
Also let me know if you have a multi meter for troubleshooting.WE will go from here.
When t fails the OK light should give us aflash code such as 2 blink pause, or3 bilnk pause. Does it not do this?
OK does the inducer motor start?
I am referring to the small vent motor where vent leaves furnace.Tell me how far in sequence it goes.
The normal sequence of operation:
Inducer vent motor comes on
Pressure switch closes
Main circulating blower comes on
If furnaces fails anywhere in the sequence we should get an error code by blinking lights on the control board. Turn power off and back on, then call for heat.tell me how far in that sequence it goes and what error code is on first failure We will go from here.
OK Rheem used 2 different igniters on these units. One is a spark and the other is hot surface. If you have hot surface, look closely to see if it may be burned or broken.
May have to remove or get a flashlight to check it
Ok f you have the spark, take a piece of sandcloth and clean both sides al well and lets see if we can get a spark and ignition
Ok we really should be getting an error code if pressures switch is not closing. Does the lick sound like it is coming from the little cylindarical switch with rubber hose from inducer?
Does igniter spark?
OK do this if you are comfortable doing so. remove the igniter from burner area, Leave attached to board. Hold the end of igniter (Using an insulated set of pliers)near a metals grounded screw and try heat to see if we get a spark. (Like you would test a lawnmower or car to see if getting fire)
OK unplug the orange wire from board and make sure it is making good connection on the little spark wire where it plugs to board. If you have a continuity meter, check the wire for continuity.
Lets try one more thing. Remove the rubber hose from inducer. Leave attached to pressure switch.Allow inducer to start, then suck on hose and see if you hear pressure switch close and get spark
I am going to say board is defective. As soon as pressure switch closes, board should signal spark