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Re: RUUD Heater and Ac MODEL #UGPH-07EAUER
It sounds like the thermostat is not functioning correctly. Has it been changed recently? I think the green wire is connected directly with red somewhere, maybe touching within the wiring in the wall. Also make sure the thermostat is set to auto not on. Sorry if you knew that but you would be surprised how many peopledon't.
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An open limit switch may make the fan run all the time. Try disconnecting the Green wire @ the furnace...if that does the trick, then either the thermostat fan relay is stuck, or there is a short between the Red & Green wires somewhere in the thermostat wire.
Does this unit also have an AC coil installed? Can you check to see if it is dirty or blocked? Although you are not cooling the heated air must still pass through this component. Has it ever been operated without a filter? How many return ducts tie into the unit and is each path filtered? Do you have filters in the individual return grilles? What do the blades on the blower look like? It sounds as if the temperature may be too high if you have to continually reset the high limit. This occurs when you have low air flow.
There is a limit switch that is likely opening. Be sure your filters are clean and all registers and grilles are open and not obstructed. If the problem continues, you may have a dirty indoor coil or undersized duct work. Some models have a window where you can observe the LED lights. If when the furnace shuts down you see any blinking, you need to count the flashes and we can figure out what the problem is from there.
Rob, the blower always blows into the furnace therefore the arrow should always point to the furnace. As far as the unit failing at times, you may have a lose wire. Inspect all wires and reconnect them after cleaning if they look suspicious. Turn off the power to the unit prior to this. Your Ruud may have a diagnostic light that may help you troubleshoot the furnace next time it fails to operate. Check on the wiring diagram that is pasted on the reverse side of one of the panels. If it indicates a flashing or blinking light, you may be able to get a starting point where to look.
Cleaning the flame sensor has nothing to do with blower motor not turning on. You either one of the following problems 1 bad cap for motor. 2 bad motor. 3 bad limit on blower housing or 4 a bad board. You will need a volt meter to check for these problems. Try seeing if the fans runs with unit of and fan switch turned to on. Also does motor hummmm. Is motor cage free ( can check by manually turning) If motor doesnt humm and the cage is free wheeling then you will need to find out if you have power going to the motor. If you find out that you do then you will need to change blower motor. If you do not have power then you will need to check limit with continuity tester on volt meter. If that checks fine only 1 thing can be wrong and that is the board.
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.
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.