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How do I locate the aux limit switch on a rudd urka gas furnace?

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Been awhile since I worked on one, but here goes. Should be 2 rollout switches on burner assembly and another in blower housing. Most are resettableand have a red button to reset.

Posted on Nov 20, 2014

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Posted on Jan 02, 2017

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pierre1811
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SOURCE: Goodman GMP125-5 limit switch open

There may be as many as 6 limit switches on the furnace. The first thing to do is turn off the power to the furnace. Look around the burner box. You will see possibly 3 small maybe brown plastic swithes with two wires to each and a button between the wires. Press the button on each one. If it clicks that's the one tripped. There may also be the same kind of switch(s) in the blower compartment. There's a self resetting limit on the middle of the furnace it also has two wires but looks like a black or dark brown plate about 2 1/2 X 3 1/2 inches. You have to check that one with an ohm meter. If any of these switches are tripped there is a reason. Check your filter and overall air flow. with low airflow the furnace may overheat. The switches around the burner box are roll out switches. Watch to see if flames are coming out of the burner area. especially when the blower comes on. DO NOT bypass any of these switches. Call a certified tech. to check it out.

Posted on Mar 02, 2009

  • 4 Answers

SOURCE: schematic diagram Rudd silouette II a/c gas furnace needed

There should be a small set of screw lugs on the electronic board in the furnace. Look for a red wire that comes out of the transformer and follow it to find where the 24V connections are.

Posted on Sep 26, 2009

  • 15 Answers

SOURCE: The flame rollout switch keeps kicking out. Theirs

Try adjusting gas pressure. There might be an inline rollout switch that looks like an inline fuse. If that is the case several techs might over look it. The best thing to check is the schematics for the furnace in the owners manual. If you follow the low voltage, you will definately see if there is a rollout switch. If it is a new unit it has one somewhere. If you paid a company to change the burners, call them to get your money back. I have only changed burners on old janitrols where there was a factory problem with the design. They are a stationary device that has no moving parts and therefore very rare if they break. The tech probably did not know and got nervous. Call the comapny and talk to the manager about the problem. You should not have to pay for parts that were not broken.

Posted on Dec 12, 2009

  • 653 Answers

SOURCE: furnace overload limit switch

Here is the service manual with wiring diagram.

Posted on Dec 19, 2009

  • 99 Answers

SOURCE: i have a rudd hot air gas furnace,ignitor sparks

to carmelmontgo; do you have a smart gas valve sometimes the wire connections get loose. remove wire connector then reinstall. also cleaning a flame sensor will work if the flame sensor is good. I would check the ground connection sometimes contaminated with rust. also I would check the gas pressure with a gas manometer...my email is alpharomeo@windstream.net

Posted on Jan 21, 2010

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Error Codes
A green LED indicates system faults
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Steady OFF: Board control fault or no power applied
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Dec 12, 2009 | Heating & Cooling

1 Answer

The flame rollout switch keeps kicking out. Theirs no flame rollout,i put new burners in it, everything looks good. unit may stay on and run for 3 or 4 cycles,and sometimes it wont stay on 30 seconds.Ive...


Try adjusting gas pressure. There might be an inline rollout switch that looks like an inline fuse. If that is the case several techs might over look it. The best thing to check is the schematics for the furnace in the owners manual. If you follow the low voltage, you will definately see if there is a rollout switch. If it is a new unit it has one somewhere. If you paid a company to change the burners, call them to get your money back. I have only changed burners on old janitrols where there was a factory problem with the design. They are a stationary device that has no moving parts and therefore very rare if they break. The tech probably did not know and got nervous. Call the comapny and talk to the manager about the problem. You should not have to pay for parts that were not broken.

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1 Answer

Schematic diagram Rudd silouette II a/c gas furnace needed


There should be a small set of screw lugs on the electronic board in the furnace. Look for a red wire that comes out of the transformer and follow it to find where the 24V connections are.

Sep 21, 2009 | Ruud UBHC Air Conditioner

1 Answer

Pressure, draft safeguard, or aux limit swtch did not close or re


The limit switches are two wires that go to a small disk about the size of a dime. There should be a tiny button between the wires. Find all the limits and push them to reset them. The draft safeguard is the one that is located where the flu pipe leaves the unit. Sometimes the limits are stubborn and it's hard to push them in. If you can't get it reset then the limit will need to be replaced but it can be bypassed temporarily by jumping the two wire together. Do no do this as a permanent fix. It can cause death.

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1 Answer

Rudd Furnace under-achiever 90 no lights nothing power going to unit and 3 amp fuse check out OK! I had the board, and blower replaced today ran for about two hours and now nothing again!Same problem!...


You say you have power but what is the voltage? You said that that you are using a 3 amp fuse so you are referring to a gas unit. Ok, have you checked the safty switch that is located on the blower cabinet, the one that the door sits against to make sure that you have power leaving the switch? Also, on some units, there is a limit switch that come directly off of the above mentioned blower cut off switch that when tripped, will cut main power to the board. Its located on the inducer or on the flu pipe, but mostly on the inducer houseing. Make sure that all your manual reset limits are reset. But check the switch first and then work your way to the limits. This is the only thing left and was probably the probablem before you replaced the board. If you have any more questions, please respond to the thread.

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2 Answers

Rudd furnace


You have a safety limit switch that is either bad or needs to be manually reset. Some have little buttons between the two wires going to the switch that you can push to reset. If not they are automatic switchs then one is bad. You have to do an ohms test to see if each switch is bad or good.

Jan 02, 2009 | Ruud UBHC Air Conditioner

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