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How do i clean a heat sensor on a Ruud furance

The se?or keep getting oxidized

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When you take it off clean it with a non-abrazive similar to a steel wool, if it oxidizes to frequent the sensor has to be replaced.
after it's cleaned to many time the coating on the sensor is gone and the build up occurs more frequently.

Posted on Apr 22, 2014

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I recently came to home to find my furance (natural gas) running but it was blowing cold air. I pulled the filter, it was dirty, cleaned it and replaced it. I turned the furance back on and it worked...


You are resetting it every time you take the panel off the front of the unit. It is locking out the circuit board. No. 1 reason for this is a dirty sensor. The flame sensor is the small rod-like part that senses the flame of the burner. It is usually pretty close to the hot surface ignitor (the part that glows bright when the furnace is igniting) Watch your furnace burner light. You will see the ignitor come on. The sensor is a little bigger than a pencil lead and it will be just a couple inches away from the ignitor.

Take the sensor loose and clean it only with fine sand paper or emery cloth. Chances are this will solve your problem. Hope this helps

Apr 21, 2011 | Heating & Cooling

1 Answer

AC IS TURNING ON BY IT SELF AFTER I SWITICH IT OFF, HOW TO SOLVE THIS PROBLEM


Sounds like a problem with the furances circuit board. With the furance powered off, disconnect the two wires at the circuit boards thermostat terminal strip. These are probably red and white wires connected to the "Y" and "C" thermostat terminal strip on the circuit board. These two wires send 24 volts to the outside A.C. condenser unit when the thermstat is se tinto the cooling mode. With the thermostst in the "off: postion measure across the "Y" & "C" terminals at the furances thermostat terminal strip. If you have voltaged than either the board or thermostst has failed. The next step to determine which has failed is this. Disconnect all the thermostat wires at the furance. To check the heating circuit jumper across the "R" & "W" terminals, the furance should fire off for the heating circuit and run non stop beacause the thermostat is no longer controlling it and is isolated from the furance. Now remove the jumper and jumper across the "R" &"Y" terminals, the blower should run at your furance for the cooling mode and you should have 24 volts across the "Y" & "C" terminals for the outside A.C. condenser compresor contactor.Next check for blower operation by jumpering across the "R" & "G" terminals. If everything checks outs than the thermostst is the problem. Tou may also want to check the control wiring at the thermostts , furance & out side condenser unit. If the wiring has connnected somewhwre between these points or at the terminal connection this may also be bring on the A.C. when the thermostat is in the "off position.

Feb 13, 2011 | Hitachi Heating & Cooling

1 Answer

No heat.. trying to see why.. gas goes on ands ten off in 10 seconds.. the yellow perge light is flashing - maybe related.. help?


Flame sensor at furance nees to be cleaned. Remove front top cover at furance. Flame sensor is located left of last burner .Remove 1/4inch screw and clean wirh fine steel whole.

Feb 03, 2011 | Honeywell Electronic Programmable...

1 Answer

Renting a house and there is a green flashing light on honewell furnace. Thermostat set at 70 but the temp is 54. Should I press the reset button or just call and bother the owners. Used to living in a...


Clean the flame sensor at the furance burner compartment. This is found left hand end farthest burner tube from ignitor, Make sure your filter is clean. Turn powwer off at furance and then turn back on to reset.

Jan 26, 2011 | Heating & Cooling

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Unless we set the thermostat very high, like 80 degrees, the heater will blow cold air. When the heat does blow, it will eventually stop blowing heat and the fan will continue to blow cold air.


Check and make sure the filter is clean. This sounds like a restriction in the system. If the unit has central cooling make sure ther indoor evaporator coil is clean at the furance.The unit may be cycling the burners on and off at the high heat limit , fan/limit control. You can also eliminate the thermostst from the furance. Turn power off at the furnace and disconnect the wiring from the thermostat. Jumper the red and white wire together. Turn the furnace back on. The furance should run in the heating mode. Try this and see if the problem is still there.

Jan 25, 2011 | Heating & Cooling

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My RUUD furance shut off within 10 seconds after strating.


you most likely have a dirty flame sensor. you will find the flame sensor on the left or right side of the burner row. it will have one wire going to it with a spade connector on it. at the other side of the burner row you will see the igniter. it is the part the glows just before ignition. do not attemp to remove or clean this as this is very brittle and can easily be broken. you can remove the spade connector from the flame sensor and then using a 1/4 or 5/16 nut driver you would be able to loosen the screw that secures the flame sensor. once you have the flame sensor out, you can clean (polish) it up with a piece of steel wool. if you do not have steel wool, use a piece of emery cloth. re-install the flame sensor and hook up the wire to it and see what happens. this is comparable to cleaning the thermocouple on the old style standing pilot furnaces and needs to be done usually each year.
good luck

Nov 20, 2010 | Heating & Cooling

1 Answer

Flame sensor oxidation problem?????


make sure you have good contact at ignition control module. if wire comes off easy crimp wire terminal with pliers until its hard to pull off. also make sure green ground wire is tight. make sure sensor is with in 1/8 in of flame. If unit is being used alot your doing the correct thing by cleaning.

Jan 24, 2010 | Heating & Cooling

1 Answer

Furance not staying on


The flame sensor is not sensing flame.

You can try cleaning it, but will probably have to replace it.

When the sensor does not detect flame after ignition, it will shut down the gas flow.

Oct 01, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

3 Answers

Ruud heater will not light consistently


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.

Dec 18, 2008 | Ruud UBHC Air Conditioner

1 Answer

Furance


There should be a flame rod that senses the flame , if not will shut off gas valve. It is a stainless steel rod that is in the flame path and wires into the panel ground. You might try to clean it with some steel wool or fine paper. Sometimes they will act up with just a little ash or sulphur deposit, even may look clean.

Apr 10, 2008 | Ruud UAKA030 Air Conditioner

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