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Check the air filter, if its dirty it will short cycle. A clogged drain will also cause the same problem. There should be a printed legend attached to the inside of the unit or cover that gives you the meaning of all the flashing trouble codes. Perhaps yours may be missing?
Then it is not communicating with the thermostat. When you turn it to cooling and the fan comes on, then the thermostat is communicating
with the furnace.
If you have 24volts between Y and C then it is communicating with the AC Unit. If you go outside and remove the electrical panel(shut off power
to outdoor unit) you can still hear the contactor being pulled in.
If you cannot hear that you need a new two wire from furnace to outdoor unit
If you are running A.C.,and the T-stat is set at 65,and the room temp is 74,the A.C. will run until the temp goes down to about 65 or so.Turn T-stat to 76 and the unit should shut down. Also,check furnace filter for dirt, and check condensor unit coils and see if they are dirty.If condensor coil is dirty it cannot breathe properly. That will cause the compressor, and the blower motor to overheat.Wash cond. coil down with water hose to clean .Start at top of coil and go sideways,slowly going down.
do you mean the inside blower or the outside unit blower ... actually the problem might be a similar part in either case ... the blower motor has a capacitor mounted on it or near it ... it will be marked something like 160 uf at 200vac or similar . it will have wires attached or plugged into it .. the capacitor is what gives the blower motor a signal to tell it which way to start turning ... once the blower is running then the capacitor is no longer needed ... its only used to get the motor started ... if its bad then the motor will hum but wont turn .. if you manually spin the fan then the motor will take off in the direction you spun it (dont get hit ) .. a new capacitor is not expensive .. you need the numbers off the old "starting" capacitor or just take it with you to the parts place to match it up .. you may be able to order it from Ruud ... a HVAC repair person would likely be able to bring one with him for repair if you give him the numbers off the part or the model number of the furnace .. make sure the blower turns freely by hand (with power off) .. if not it may need bearings lubed .. ..
Try cycling the switch at the furnace to reset the blower board. If this doesn't work remove the green wire from the blower board(computer board) to eliminate a shorted t-stat or shorted wire between the furance and t-stat. If blower remains on, then blower board is shorted. I've seen all these problems.
does the furnace ignite?? your system may not have been lighting and has gone into ignition lockout count the codes of the led lights then remove panel led diagnostic codes are listed there.
if led codes indicate no problem verify capacitor is good and that mtr is getting 115 volts.